diff --git a/pytest_tests/testsuites/acl/conftest.py b/pytest_tests/testsuites/acl/conftest.py
index b8876db..5be6394 100644
--- a/pytest_tests/testsuites/acl/conftest.py
+++ b/pytest_tests/testsuites/acl/conftest.py
@@ -13,6 +13,7 @@ from frostfs_testlib.steps.cli.object import put_object_to_random_node
 from frostfs_testlib.storage.cluster import Cluster
 from frostfs_testlib.storage.dataclasses.acl import EACLRole
 from frostfs_testlib.storage.dataclasses.frostfs_services import InnerRing, StorageNode
+from frostfs_testlib.storage.dataclasses.object_size import ObjectSize
 from frostfs_testlib.utils import wallet_utils
 from frostfs_testlib.utils.file_utils import generate_file
 
@@ -69,8 +70,8 @@ def wallets(default_wallet: str, temp_directory: str, cluster: Cluster) -> Walle
 
 
 @pytest.fixture(scope="module")
-def file_path(simple_object_size: int) -> str:
-    yield generate_file(simple_object_size)
+def file_path(simple_object_size: ObjectSize) -> str:
+    yield generate_file(simple_object_size.value)
 
 
 @pytest.fixture(scope="function")
diff --git a/pytest_tests/testsuites/conftest.py b/pytest_tests/testsuites/conftest.py
index 48ce0b4..b4b61f1 100644
--- a/pytest_tests/testsuites/conftest.py
+++ b/pytest_tests/testsuites/conftest.py
@@ -24,6 +24,7 @@ from frostfs_testlib.steps.node_management import storage_node_healthcheck
 from frostfs_testlib.steps.s3 import s3_helper
 from frostfs_testlib.storage.cluster import Cluster
 from frostfs_testlib.storage.controllers.cluster_state_controller import ClusterStateController
+from frostfs_testlib.storage.dataclasses.object_size import ObjectSize
 from frostfs_testlib.storage.dataclasses.wallet import WalletFactory, WalletInfo
 from frostfs_testlib.testing.cluster_test_base import ClusterTestBase
 from frostfs_testlib.utils import env_utils, version_utils
@@ -115,12 +116,14 @@ def max_object_size(cluster: Cluster, client_shell: Shell) -> int:
 
 @pytest.fixture(scope="session")
 def simple_object_size(max_object_size: int) -> int:
-    yield int(SIMPLE_OBJECT_SIZE) if int(SIMPLE_OBJECT_SIZE) < max_object_size else max_object_size
+    size = min(int(SIMPLE_OBJECT_SIZE), max_object_size)
+    return ObjectSize("simple", size)
 
 
 @pytest.fixture(scope="session")
 def complex_object_size(max_object_size: int) -> int:
-    return max_object_size * int(COMPLEX_OBJECT_CHUNKS_COUNT) + int(COMPLEX_OBJECT_TAIL_SIZE)
+    size = max_object_size * int(COMPLEX_OBJECT_CHUNKS_COUNT) + int(COMPLEX_OBJECT_TAIL_SIZE)
+    return ObjectSize("complex", size)
 
 
 @pytest.fixture(scope="session")
diff --git a/pytest_tests/testsuites/failovers/test_failover_network.py b/pytest_tests/testsuites/failovers/test_failover_network.py
index 82a5199..0fe9699 100644
--- a/pytest_tests/testsuites/failovers/test_failover_network.py
+++ b/pytest_tests/testsuites/failovers/test_failover_network.py
@@ -8,6 +8,7 @@ from frostfs_testlib.resources.wellknown_acl import PUBLIC_ACL
 from frostfs_testlib.steps.cli.container import create_container
 from frostfs_testlib.steps.cli.object import get_object, put_object_to_random_node
 from frostfs_testlib.storage.cluster import StorageNode
+from frostfs_testlib.storage.dataclasses.object_size import ObjectSize
 from frostfs_testlib.testing.cluster_test_base import ClusterTestBase
 from frostfs_testlib.utils.failover_utils import (
     wait_all_storage_nodes_returned,
@@ -45,7 +46,7 @@ class TestFailoverNetwork(ClusterTestBase):
         self,
         default_wallet: str,
         require_multiple_hosts,
-        simple_object_size: int,
+        simple_object_size: ObjectSize,
     ):
         """
         Block storage nodes traffic using iptables and wait for replication for objects.
@@ -55,7 +56,7 @@ class TestFailoverNetwork(ClusterTestBase):
         wakeup_node_timeout = 10  # timeout to let nodes detect that traffic has blocked
         nodes_to_block_count = 2
 
-        source_file_path = generate_file(simple_object_size)
+        source_file_path = generate_file(simple_object_size.value)
         cid = create_container(
             wallet,
             shell=self.shell,
diff --git a/pytest_tests/testsuites/failovers/test_failover_server.py b/pytest_tests/testsuites/failovers/test_failover_server.py
index c87e6b5..8ac3c9e 100644
--- a/pytest_tests/testsuites/failovers/test_failover_server.py
+++ b/pytest_tests/testsuites/failovers/test_failover_server.py
@@ -16,6 +16,7 @@ from frostfs_testlib.steps.cli.object import get_object
 from frostfs_testlib.steps.node_management import check_node_in_map, check_node_not_in_map
 from frostfs_testlib.storage.cluster import ClusterNode, StorageNode
 from frostfs_testlib.storage.controllers import ClusterStateController
+from frostfs_testlib.storage.dataclasses.object_size import ObjectSize
 from frostfs_testlib.storage.dataclasses.storage_object_info import StorageObjectInfo
 from frostfs_testlib.storage.dataclasses.wallet import WalletInfo
 from frostfs_testlib.testing.cluster_test_base import ClusterTestBase
@@ -75,15 +76,15 @@ class TestFailoverServer(ClusterTestBase):
         self,
         request: FixtureRequest,
         containers: list[StorageContainer],
-        simple_object_size: int,
-        complex_object_size: int,
+        simple_object_size: ObjectSize,
+        complex_object_size: ObjectSize,
     ) -> StorageObjectInfo:
         count_object = request.param
-        object_size = [simple_object_size, complex_object_size]
+        object_sizes = [simple_object_size, complex_object_size]
         object_list = []
         for cont in containers:
             for _ in range(count_object):
-                object_list.append(cont.generate_object(size=random.choice(object_size)))
+                object_list.append(cont.generate_object(size=random.choice(object_sizes).value))
 
         for storage_object in object_list:
             os.remove(storage_object.file_path)
diff --git a/pytest_tests/testsuites/failovers/test_failover_storage.py b/pytest_tests/testsuites/failovers/test_failover_storage.py
index cd56f09..c378321 100644
--- a/pytest_tests/testsuites/failovers/test_failover_storage.py
+++ b/pytest_tests/testsuites/failovers/test_failover_storage.py
@@ -27,6 +27,7 @@ from frostfs_testlib.steps.node_management import (
 from frostfs_testlib.steps.s3 import s3_helper
 from frostfs_testlib.storage.cluster import Cluster, ClusterNode, StorageNode
 from frostfs_testlib.storage.controllers import ClusterStateController, ShardsWatcher
+from frostfs_testlib.storage.dataclasses.object_size import ObjectSize
 from frostfs_testlib.storage.dataclasses.storage_object_info import StorageObjectInfo
 from frostfs_testlib.storage.dataclasses.wallet import WalletInfo
 from frostfs_testlib.testing.cluster_test_base import ClusterTestBase
@@ -43,6 +44,11 @@ logger = logging.getLogger("NeoLogger")
 stopped_nodes: list[StorageNode] = []
 
 
+def pytest_generate_tests(metafunc: pytest.Metafunc):
+    if "s3_client" in metafunc.fixturenames:
+        metafunc.parametrize("s3_client", [AwsCliClient, Boto3ClientWrapper], indirect=True)
+
+
 @pytest.fixture(scope="function")
 @allure.title("Provide File Keeper")
 def file_keeper():
@@ -92,14 +98,18 @@ def return_stopped_hosts(shell: Shell, cluster: Cluster) -> None:
 @pytest.mark.failover
 class TestFailoverStorage(ClusterTestBase):
     @allure.title("Lose and return storage node's host")
-    @pytest.mark.parametrize("hard_reboot", [True, False])
+    @pytest.mark.parametrize("stop_mode", ["hard", "soft"])
     @pytest.mark.failover_reboot
     def test_lose_storage_node_host(
-        self, default_wallet, hard_reboot: bool, require_multiple_hosts, simple_object_size
+        self,
+        default_wallet,
+        stop_mode: str,
+        require_multiple_hosts,
+        simple_object_size: ObjectSize,
     ):
         wallet = default_wallet
         placement_rule = "REP 2 IN X CBF 2 SELECT 2 FROM * AS X"
-        source_file_path = generate_file(simple_object_size)
+        source_file_path = generate_file(simple_object_size.value)
         cid = create_container(
             wallet,
             shell=self.shell,
@@ -118,7 +128,7 @@ class TestFailoverStorage(ClusterTestBase):
             stopped_nodes.append(node)
 
             with allure.step(f"Stop host {node}"):
-                node.host.stop_host("hard" if hard_reboot else "soft")
+                node.host.stop_host(stop_mode)
 
             new_nodes = wait_object_replication(
                 cid,
@@ -151,11 +161,11 @@ class TestFailoverStorage(ClusterTestBase):
     @pytest.mark.parametrize("sequence", [True, False])
     @pytest.mark.failover_panic
     def test_panic_storage_node_host(
-        self, default_wallet, require_multiple_hosts, sequence: bool, simple_object_size
+        self, default_wallet, require_multiple_hosts, sequence: bool, simple_object_size: ObjectSize
     ):
         wallet = default_wallet
         placement_rule = "REP 2 IN X CBF 2 SELECT 2 FROM * AS X"
-        source_file_path = generate_file(simple_object_size)
+        source_file_path = generate_file(simple_object_size.value)
         cid = create_container(
             wallet,
             shell=self.shell,
@@ -223,7 +233,7 @@ class TestFailoverStorage(ClusterTestBase):
     def test_unhealthy_tree(
         self,
         s3_client: S3ClientWrapper,
-        simple_object_size: int,
+        simple_object_size: ObjectSize,
         cluster_state_controller: ClusterStateController,
         after_run_return_all_stopped_s3,
         after_run_return_all_stopped_services,
@@ -248,7 +258,7 @@ class TestFailoverStorage(ClusterTestBase):
                 location_constraint="load-1-1",
             )
 
-        file_path = generate_file(simple_object_size)
+        file_path = generate_file(simple_object_size.value)
         file_name = s3_helper.object_key_from_file_path(file_path)
         with allure.step("Put object into bucket"):
             put_object = s3_client.put_object(bucket, file_path)
@@ -263,11 +273,6 @@ class TestFailoverStorage(ClusterTestBase):
             s3_helper.check_objects_in_bucket(s3_client, bucket, expected_objects=[file_name])
 
 
-def pytest_generate_tests(metafunc: pytest.Metafunc):
-    if "s3_client" in metafunc.fixturenames:
-        metafunc.parametrize("s3_client", [AwsCliClient, Boto3ClientWrapper], indirect=True)
-
-
 @pytest.mark.failover
 @pytest.mark.failover_empty_map
 class TestEmptyMap(ClusterTestBase):
@@ -294,7 +299,7 @@ class TestEmptyMap(ClusterTestBase):
         self,
         s3_client: S3ClientWrapper,
         bucket: str,
-        simple_object_size: int,
+        simple_object_size: ObjectSize,
         empty_map_offline_teardown,
     ):
         """
@@ -311,7 +316,7 @@ class TestEmptyMap(ClusterTestBase):
             bucket: bucket which contains tested object
             simple_object_size: size of object
         """
-        file_path = generate_file(simple_object_size)
+        file_path = generate_file(simple_object_size.value)
         file_name = s3_helper.object_key_from_file_path(file_path)
         bucket_objects = [file_name]
 
@@ -364,7 +369,7 @@ class TestEmptyMap(ClusterTestBase):
         self,
         s3_client: S3ClientWrapper,
         bucket: str,
-        simple_object_size: int,
+        simple_object_size: ObjectSize,
         empty_map_stop_service_teardown,
     ):
         """
@@ -384,7 +389,7 @@ class TestEmptyMap(ClusterTestBase):
             bucket: bucket which contains tested object
             simple_object_size: size of object
         """
-        file_path = generate_file(simple_object_size)
+        file_path = generate_file(simple_object_size.value)
         file_name = s3_helper.object_key_from_file_path(file_path)
         bucket_objects = [file_name]
 
@@ -438,13 +443,13 @@ class TestEmptyMap(ClusterTestBase):
     def test_s3_fstree_blobovnicza_loss_versioning_on(
         self,
         s3_client: S3ClientWrapper,
-        simple_object_size: int,
+        simple_object_size: ObjectSize,
         cluster_state_controller: ClusterStateController,
     ):
         bucket = s3_client.create_bucket()
         s3_helper.set_bucket_versioning(s3_client, bucket, VersioningStatus.ENABLED)
 
-        file_path = generate_file(simple_object_size)
+        file_path = generate_file(simple_object_size.value)
         file_name = s3_helper.object_key_from_file_path(file_path)
 
         object_versions = []
@@ -483,12 +488,12 @@ class TestEmptyMap(ClusterTestBase):
     def test_s3_fstree_blobovnicza_loss_versioning_off(
         self,
         s3_client: S3ClientWrapper,
-        simple_object_size: int,
+        simple_object_size: ObjectSize,
         cluster_state_controller: ClusterStateController,
     ):
         bucket = s3_client.create_bucket()
 
-        file_path = generate_file(simple_object_size)
+        file_path = generate_file(simple_object_size.value)
         file_name = s3_helper.object_key_from_file_path(file_path)
 
         with allure.step("Put object into one bucket"):
@@ -526,7 +531,7 @@ class TestEmptyMap(ClusterTestBase):
     def test_s3_pilorama_loss(
         self,
         s3_client: S3ClientWrapper,
-        simple_object_size: int,
+        simple_object_size: ObjectSize,
         versioning_status: VersioningStatus,
         cluster_state_controller: ClusterStateController,
     ):
@@ -534,7 +539,7 @@ class TestEmptyMap(ClusterTestBase):
         if versioning_status:
             s3_helper.set_bucket_versioning(s3_client, bucket, versioning_status)
 
-        file_path = generate_file(simple_object_size)
+        file_path = generate_file(simple_object_size.value)
         file_name = s3_helper.object_key_from_file_path(file_path)
 
         with allure.step("Put object into one bucket"):
@@ -586,8 +591,8 @@ class TestStorageDataLoss(ClusterTestBase):
     def test_metabase_loss(
         self,
         s3_client: S3ClientWrapper,
-        simple_object_size: int,
-        complex_object_size: int,
+        simple_object_size: ObjectSize,
+        complex_object_size: ObjectSize,
         cluster_state_controller: ClusterStateController,
         after_run_return_all_stopped_services: str,
         file_keeper: FileKeeper,
@@ -598,10 +603,10 @@ class TestStorageDataLoss(ClusterTestBase):
             bucket = s3_client.create_bucket()
 
         with allure.step("Put objects into bucket"):
-            simple_object_path = generate_file(simple_object_size)
+            simple_object_path = generate_file(simple_object_size.value)
             simple_object_key = s3_helper.object_key_from_file_path(simple_object_path)
 
-            complex_object_path = generate_file(complex_object_size)
+            complex_object_path = generate_file(complex_object_size.value)
             complex_object_key = s3_helper.object_key_from_file_path(complex_object_path)
 
             s3_client.put_object(bucket, simple_object_path)
@@ -651,7 +656,7 @@ class TestStorageDataLoss(ClusterTestBase):
     def test_write_cache_loss_on_one_node(
         self,
         node_under_test: ClusterNode,
-        simple_object_size: int,
+        simple_object_size: ObjectSize,
         cluster_state_controller: ClusterStateController,
         shards_watcher: ShardsWatcher,
         default_wallet: str,
@@ -683,7 +688,8 @@ class TestStorageDataLoss(ClusterTestBase):
             storage_objects: list[StorageObjectInfo] = []
             for _ in range(5):
                 storage_object = container.generate_object(
-                    simple_object_size, endpoint=node_under_test.storage_node.get_rpc_endpoint()
+                    simple_object_size.value,
+                    endpoint=node_under_test.storage_node.get_rpc_endpoint(),
                 )
                 storage_objects.append(storage_object)
 
@@ -738,7 +744,7 @@ class TestStorageDataLoss(ClusterTestBase):
         self,
         bucket,
         s3_client: S3ClientWrapper,
-        simple_object_size: int,
+        simple_object_size: ObjectSize,
         after_run_return_all_stopped_services,
         cluster_state_controller: ClusterStateController,
     ):
@@ -752,7 +758,7 @@ class TestStorageDataLoss(ClusterTestBase):
             # waiting for rebalance connection of s3 gate to storage service
             sleep(60)
 
-        file_path = generate_file(simple_object_size)
+        file_path = generate_file(simple_object_size.value)
         file_name = s3_helper.object_key_from_file_path(file_path)
         with allure.step("Put object into one bucket"):
             put_object = s3_client.put_object(bucket, file_path)
@@ -762,7 +768,7 @@ class TestStorageDataLoss(ClusterTestBase):
     def test_s3_one_pilorama_loss(
         self,
         s3_client: S3ClientWrapper,
-        simple_object_size: int,
+        simple_object_size: ObjectSize,
         cluster_state_controller: ClusterStateController,
     ):
         bucket = s3_client.create_bucket(
@@ -775,7 +781,7 @@ class TestStorageDataLoss(ClusterTestBase):
             bucket_versioning = s3_client.get_bucket_versioning_status(bucket)
             assert bucket_versioning == "Enabled", "Bucket should have enabled versioning"
 
-        file_path = generate_file(simple_object_size)
+        file_path = generate_file(simple_object_size.value)
         file_name = s3_helper.object_key_from_file_path(file_path)
 
         object_versions = []
diff --git a/pytest_tests/testsuites/network/test_node_management.py b/pytest_tests/testsuites/network/test_node_management.py
index 5164786..97a8f1e 100644
--- a/pytest_tests/testsuites/network/test_node_management.py
+++ b/pytest_tests/testsuites/network/test_node_management.py
@@ -33,6 +33,7 @@ from frostfs_testlib.steps.node_management import (
 )
 from frostfs_testlib.steps.storage_policy import get_nodes_with_object, get_simple_object_copies
 from frostfs_testlib.storage.cluster import StorageNode
+from frostfs_testlib.storage.dataclasses.object_size import ObjectSize
 from frostfs_testlib.testing.cluster_test_base import ClusterTestBase
 from frostfs_testlib.utils import datetime_utils, string_utils
 from frostfs_testlib.utils.failover_utils import wait_object_replication
@@ -54,9 +55,9 @@ class TestNodeManagement(ClusterTestBase):
     @pytest.fixture
     @allure.title("Create container and pick the node with data")
     def create_container_and_pick_node(
-        self, default_wallet: str, simple_object_size
+        self, default_wallet: str, simple_object_size: ObjectSize
     ) -> Tuple[str, StorageNode]:
-        file_path = generate_file(simple_object_size)
+        file_path = generate_file(simple_object_size.value)
         placement_rule = "REP 1 IN X CBF 1 SELECT 1 FROM * AS X"
         endpoint = self.cluster.default_rpc_endpoint
 
@@ -129,9 +130,9 @@ class TestNodeManagement(ClusterTestBase):
     @pytest.mark.add_nodes
     def test_add_nodes(
         self,
-        default_wallet,
+        default_wallet: str,
+        simple_object_size: ObjectSize,
         return_nodes_after_test_run,
-        simple_object_size,
     ):
         """
         This test remove one node from frostfs_testlib.storage.cluster then add it back. Test uses base control operations with storage nodes (healthcheck, netmap-snapshot, set-status).
@@ -139,7 +140,7 @@ class TestNodeManagement(ClusterTestBase):
         wallet = default_wallet
         placement_rule_3 = "REP 3 IN X CBF 1 SELECT 3 FROM * AS X"
         placement_rule_4 = "REP 4 IN X CBF 1 SELECT 4 FROM * AS X"
-        source_file_path = generate_file(simple_object_size)
+        source_file_path = generate_file(simple_object_size.value)
 
         storage_nodes = self.cluster.storage_nodes
         random_node = random.choice(storage_nodes[1:])
@@ -226,13 +227,13 @@ class TestNodeManagement(ClusterTestBase):
     @pytest.mark.node_mgmt
     @allure.title("Test object copies based on placement policy")
     def test_placement_policy(
-        self, default_wallet, placement_rule, expected_copies, simple_object_size
+        self, default_wallet, placement_rule, expected_copies, simple_object_size: ObjectSize
     ):
         """
         This test checks object's copies based on container's placement policy.
         """
         wallet = default_wallet
-        file_path = generate_file(simple_object_size)
+        file_path = generate_file(simple_object_size.value)
         self.validate_object_copies(wallet, placement_rule, file_path, expected_copies)
 
     @pytest.mark.parametrize(
@@ -292,14 +293,14 @@ class TestNodeManagement(ClusterTestBase):
         placement_rule,
         expected_copies,
         expected_nodes_id: set[int],
-        simple_object_size,
+        simple_object_size: ObjectSize,
     ):
         """
         Based on container's placement policy check that storage nodes are piked correctly and object has
         correct copies amount.
         """
         wallet = default_wallet
-        file_path = generate_file(simple_object_size)
+        file_path = generate_file(simple_object_size.value)
         cid, oid, found_nodes = self.validate_object_copies(
             wallet, placement_rule, file_path, expected_copies
         )
@@ -317,27 +318,28 @@ class TestNodeManagement(ClusterTestBase):
     @pytest.mark.node_mgmt
     @allure.title("Negative cases for placement policy")
     def test_placement_policy_negative(
-        self, default_wallet, placement_rule, expected_copies, simple_object_size
+        self, default_wallet, placement_rule, expected_copies, simple_object_size: ObjectSize
     ):
         """
         Negative test for placement policy.
         """
         wallet = default_wallet
-        file_path = generate_file(simple_object_size)
+        file_path = generate_file(simple_object_size.value)
         with pytest.raises(RuntimeError, match=".*not enough nodes to SELECT from.*"):
             self.validate_object_copies(wallet, placement_rule, file_path, expected_copies)
 
     @pytest.mark.node_mgmt
     @allure.title("FrostFS object could be dropped using control command")
-    def test_drop_object(self, default_wallet, complex_object_size: int, simple_object_size: int):
+    def test_drop_object(
+        self, default_wallet, complex_object_size: ObjectSize, simple_object_size: ObjectSize
+    ):
         """
         Test checks object could be dropped using `frostfs-cli control drop-objects` command.
         """
         wallet = default_wallet
         endpoint = self.cluster.default_rpc_endpoint
-        file_path_simple, file_path_complex = generate_file(simple_object_size), generate_file(
-            complex_object_size
-        )
+        file_path_simple = generate_file(simple_object_size.value)
+        file_path_complex = generate_file(complex_object_size.value)
 
         locode = get_locode_from_random_node(self.cluster)
         rule = f"REP 1 CBF 1 SELECT 1 FROM * FILTER 'UN-LOCODE' EQ '{locode}' AS LOC"
@@ -375,10 +377,10 @@ class TestNodeManagement(ClusterTestBase):
         self,
         default_wallet,
         create_container_and_pick_node,
-        simple_object_size,
+        simple_object_size: ObjectSize,
     ):
         wallet = default_wallet
-        file_path = generate_file(simple_object_size)
+        file_path = generate_file(simple_object_size.value)
 
         cid, node = create_container_and_pick_node
         original_oid = put_object_to_random_node(wallet, file_path, cid, self.shell, self.cluster)
@@ -415,10 +417,12 @@ class TestNodeManagement(ClusterTestBase):
 
     @pytest.mark.node_mgmt
     @allure.title("Put object with stopped node")
-    def test_stop_node(self, default_wallet, return_nodes_after_test_run, simple_object_size: int):
+    def test_stop_node(
+        self, default_wallet, return_nodes_after_test_run, simple_object_size: ObjectSize
+    ):
         wallet = default_wallet
         placement_rule = "REP 3 SELECT 4 FROM * AS X"
-        source_file_path = generate_file(simple_object_size)
+        source_file_path = generate_file(simple_object_size.value)
         storage_nodes = self.cluster.storage_nodes
         random_node = random.choice(storage_nodes[1:])
         alive_node = random.choice(
diff --git a/pytest_tests/testsuites/object/test_object_api.py b/pytest_tests/testsuites/object/test_object_api.py
index dad31cf..aefafae 100755
--- a/pytest_tests/testsuites/object/test_object_api.py
+++ b/pytest_tests/testsuites/object/test_object_api.py
@@ -25,6 +25,7 @@ from frostfs_testlib.steps.complex_object_actions import get_complex_object_spli
 from frostfs_testlib.steps.storage_object import delete_objects
 from frostfs_testlib.steps.storage_policy import get_complex_object_copies, get_simple_object_copies
 from frostfs_testlib.storage.cluster import Cluster
+from frostfs_testlib.storage.dataclasses.object_size import ObjectSize
 from frostfs_testlib.storage.dataclasses.storage_object_info import StorageObjectInfo
 from frostfs_testlib.testing.cluster_test_base import ClusterTestBase
 from frostfs_testlib.utils.file_utils import generate_file, get_file_content, get_file_hash
@@ -90,7 +91,7 @@ def generate_ranges(
 
 @pytest.fixture(
     params=[pytest.lazy_fixture("simple_object_size"), pytest.lazy_fixture("complex_object_size")],
-    ids=["simple object", "complex object"],
+    ids=["simple object size", "complex object size"],
     # Scope session to upload/delete each files set only once
     scope="module",
 )
@@ -100,8 +101,9 @@ def storage_objects(
     wallet = default_wallet
     # Separate containers for complex/simple objects to avoid side-effects
     cid = create_container(wallet, shell=client_shell, endpoint=cluster.default_rpc_endpoint)
+    object_size: ObjectSize = request.param
 
-    file_path = generate_file(request.param)
+    file_path = generate_file(object_size.value)
     file_hash = get_file_hash(file_path)
 
     storage_objects = []
@@ -119,7 +121,7 @@ def storage_objects(
             )
 
             storage_object = StorageObjectInfo(cid, storage_object_id)
-            storage_object.size = request.param
+            storage_object.size = object_size.value
             storage_object.wallet_file_path = wallet
             storage_object.file_path = file_path
             storage_object.file_hash = file_hash
@@ -138,7 +140,10 @@ def storage_objects(
 class TestObjectApi(ClusterTestBase):
     @allure.title("Validate object storage policy by native API")
     def test_object_storage_policies(
-        self, request: FixtureRequest, storage_objects: list[StorageObjectInfo], simple_object_size
+        self,
+        request: FixtureRequest,
+        storage_objects: list[StorageObjectInfo],
+        simple_object_size: ObjectSize,
     ):
         """
         Validate object storage policy
@@ -149,7 +154,7 @@ class TestObjectApi(ClusterTestBase):
 
         with allure.step("Validate storage policy for objects"):
             for storage_object in storage_objects:
-                if storage_object.size == simple_object_size:
+                if storage_object.size == simple_object_size.value:
                     copies = get_simple_object_copies(
                         storage_object.wallet_file_path,
                         storage_object.cid,
@@ -265,10 +270,10 @@ class TestObjectApi(ClusterTestBase):
     @pytest.mark.parametrize(
         "object_size",
         [pytest.lazy_fixture("simple_object_size"), pytest.lazy_fixture("complex_object_size")],
-        ids=["simple object", "complex object"],
+        ids=["simple object size", "complex object size"],
     )
     def test_object_search_should_return_tombstone_items(
-        self, default_wallet: str, request: FixtureRequest, object_size: int
+        self, default_wallet: str, request: FixtureRequest, object_size: ObjectSize
     ):
         """
         Validate object search with removed items
@@ -281,13 +286,13 @@ class TestObjectApi(ClusterTestBase):
         cid = create_container(wallet, self.shell, self.cluster.default_rpc_endpoint)
 
         with allure.step("Upload file"):
-            file_path = generate_file(object_size)
+            file_path = generate_file(object_size.value)
             file_hash = get_file_hash(file_path)
 
             storage_object = StorageObjectInfo(
                 cid=cid,
                 oid=put_object_to_random_node(wallet, file_path, cid, self.shell, self.cluster),
-                size=object_size,
+                size=object_size.value,
                 wallet_file_path=wallet,
                 file_path=file_path,
                 file_hash=file_hash,
diff --git a/pytest_tests/testsuites/object/test_object_api_bearer.py b/pytest_tests/testsuites/object/test_object_api_bearer.py
index 992b137..39c35e6 100644
--- a/pytest_tests/testsuites/object/test_object_api_bearer.py
+++ b/pytest_tests/testsuites/object/test_object_api_bearer.py
@@ -15,6 +15,7 @@ from frostfs_testlib.steps.epoch import get_epoch
 from frostfs_testlib.steps.storage_object import StorageObjectInfo
 from frostfs_testlib.storage.cluster import Cluster
 from frostfs_testlib.storage.dataclasses.acl import EACLAccess, EACLOperation, EACLRole, EACLRule
+from frostfs_testlib.storage.dataclasses.object_size import ObjectSize
 from frostfs_testlib.storage.dataclasses.wallet import WalletInfo
 from frostfs_testlib.testing.cluster_test_base import ClusterTestBase
 from frostfs_testlib.testing.test_control import expect_not_raises
@@ -69,10 +70,11 @@ def storage_objects(
 ) -> list[StorageObjectInfo]:
     epoch = get_epoch(client_shell, cluster)
     storage_objects: list[StorageObjectInfo] = []
+    object_size: ObjectSize = request.param
     for node in cluster.storage_nodes:
         storage_objects.append(
             user_container.generate_object(
-                request.param,
+                object_size.value,
                 epoch + 3,
                 bearer_token=bearer_token_file_all_allow,
                 endpoint=node.get_rpc_endpoint(),
@@ -93,7 +95,7 @@ class TestObjectApiWithBearerToken(ClusterTestBase):
     @pytest.mark.parametrize(
         "storage_objects",
         [pytest.lazy_fixture("simple_object_size"), pytest.lazy_fixture("complex_object_size")],
-        ids=["simple object", "complex object"],
+        ids=["simple object size", "complex object size"],
         indirect=True,
     )
     def test_delete_object_with_s3_wallet_bearer(
@@ -127,14 +129,14 @@ class TestObjectApiWithBearerToken(ClusterTestBase):
         indirect=True,
     )
     @pytest.mark.parametrize(
-        "file_size",
+        "object_size",
         [pytest.lazy_fixture("simple_object_size"), pytest.lazy_fixture("complex_object_size")],
-        ids=["simple object", "complex object"],
+        ids=["simple object size", "complex object size"],
     )
     def test_get_object_with_s3_wallet_bearer_from_all_nodes(
         self,
         user_container: StorageContainer,
-        file_size: int,
+        object_size: ObjectSize,
         bearer_token_file_all_allow: str,
         request: FixtureRequest,
     ):
@@ -146,7 +148,7 @@ class TestObjectApiWithBearerToken(ClusterTestBase):
         with allure.step("Put one object to container"):
             epoch = self.get_epoch()
             storage_object = user_container.generate_object(
-                file_size, epoch + 3, bearer_token=bearer_token_file_all_allow
+                object_size.value, epoch + 3, bearer_token=bearer_token_file_all_allow
             )
 
         with allure.step("Try to fetch object from each storage node"):
diff --git a/pytest_tests/testsuites/object/test_object_lifetime.py b/pytest_tests/testsuites/object/test_object_lifetime.py
index bf04eaf..a736cab 100644
--- a/pytest_tests/testsuites/object/test_object_lifetime.py
+++ b/pytest_tests/testsuites/object/test_object_lifetime.py
@@ -4,8 +4,13 @@ import allure
 import pytest
 from frostfs_testlib.resources.error_patterns import OBJECT_NOT_FOUND
 from frostfs_testlib.steps.cli.container import create_container
-from frostfs_testlib.steps.cli.object import get_object_from_random_node, put_object_to_random_node, head_object
+from frostfs_testlib.steps.cli.object import (
+    get_object_from_random_node,
+    head_object,
+    put_object_to_random_node,
+)
 from frostfs_testlib.steps.epoch import get_epoch
+from frostfs_testlib.storage.dataclasses.object_size import ObjectSize
 from frostfs_testlib.testing.cluster_test_base import ClusterTestBase
 from frostfs_testlib.utils.file_utils import generate_file, get_file_hash
 from pytest import FixtureRequest
@@ -22,10 +27,10 @@ class TestObjectApiLifetime(ClusterTestBase):
     @pytest.mark.parametrize(
         "object_size",
         [pytest.lazy_fixture("simple_object_size"), pytest.lazy_fixture("complex_object_size")],
-        ids=["simple object", "complex object"],
+        ids=["simple object size", "complex object size"],
     )
     def test_object_api_lifetime(
-        self, default_wallet: str, request: FixtureRequest, object_size: int
+        self, default_wallet: str, request: FixtureRequest, object_size: ObjectSize
     ):
         """
         Test object deleted after expiration epoch.
@@ -37,7 +42,7 @@ class TestObjectApiLifetime(ClusterTestBase):
         endpoint = self.cluster.default_rpc_endpoint
         cid = create_container(wallet, self.shell, endpoint)
 
-        file_path = generate_file(object_size)
+        file_path = generate_file(object_size.value)
         file_hash = get_file_hash(file_path)
         epoch = get_epoch(self.shell, self.cluster)
 
diff --git a/pytest_tests/testsuites/object/test_object_lock.py b/pytest_tests/testsuites/object/test_object_lock.py
index 5b72da8..648ade0 100755
--- a/pytest_tests/testsuites/object/test_object_lock.py
+++ b/pytest_tests/testsuites/object/test_object_lock.py
@@ -26,6 +26,7 @@ from frostfs_testlib.steps.node_management import drop_object
 from frostfs_testlib.steps.storage_object import delete_objects
 from frostfs_testlib.steps.storage_policy import get_nodes_with_object
 from frostfs_testlib.storage.cluster import Cluster
+from frostfs_testlib.storage.dataclasses.object_size import ObjectSize
 from frostfs_testlib.storage.dataclasses.storage_object_info import (
     LockObjectInfo,
     StorageObjectInfo,
@@ -75,12 +76,13 @@ def locked_storage_object(
     """
     Intention of this fixture is to provide storage object which is NOT expected to be deleted during test act phase
     """
+    object_size: ObjectSize = request.param
     with allure.step("Creating locked object"):
         current_epoch = ensure_fresh_epoch(client_shell, cluster)
         expiration_epoch = current_epoch + FIXTURE_LOCK_LIFETIME
 
         storage_object = user_container.generate_object(
-            request.param, expire_at=current_epoch + FIXTURE_OBJECT_LIFETIME
+            object_size.value, expire_at=current_epoch + FIXTURE_OBJECT_LIFETIME
         )
         lock_object_id = lock_object(
             storage_object.wallet_file_path,
@@ -135,11 +137,12 @@ class TestObjectLockWithGrpc(ClusterTestBase):
         Intention of this fixture is to provide new storage object for tests which may delete or corrupt the object or it's complementary objects
         So we need a new one each time we ask for it
         """
+        object_size: ObjectSize = request.param
         with allure.step("Creating locked object"):
             current_epoch = self.get_epoch()
 
             storage_object = user_container.generate_object(
-                request.param, expire_at=current_epoch + FIXTURE_OBJECT_LIFETIME
+                object_size.value, expire_at=current_epoch + FIXTURE_OBJECT_LIFETIME
             )
             lock_object(
                 storage_object.wallet_file_path,
@@ -156,7 +159,7 @@ class TestObjectLockWithGrpc(ClusterTestBase):
     @pytest.mark.parametrize(
         "locked_storage_object",
         [pytest.lazy_fixture("simple_object_size"), pytest.lazy_fixture("complex_object_size")],
-        ids=["simple object", "complex object"],
+        ids=["simple object size", "complex object size"],
         indirect=True,
     )
     def test_locked_object_cannot_be_deleted(
@@ -279,13 +282,13 @@ class TestObjectLockWithGrpc(ClusterTestBase):
     @pytest.mark.parametrize(
         "object_size",
         [pytest.lazy_fixture("simple_object_size"), pytest.lazy_fixture("complex_object_size")],
-        ids=["simple object", "complex object"],
+        ids=["simple object size", "complex object size"],
     )
     def test_expired_object_should_be_deleted_after_locks_are_expired(
         self,
         request: FixtureRequest,
         user_container: StorageContainer,
-        object_size: int,
+        object_size: ObjectSize,
     ):
         """
         Expired object should be deleted after locks are expired
@@ -295,7 +298,9 @@ class TestObjectLockWithGrpc(ClusterTestBase):
         )
 
         current_epoch = self.ensure_fresh_epoch()
-        storage_object = user_container.generate_object(object_size, expire_at=current_epoch + 1)
+        storage_object = user_container.generate_object(
+            object_size.value, expire_at=current_epoch + 1
+        )
 
         with allure.step("Lock object for couple epochs"):
             lock_object(
@@ -347,13 +352,13 @@ class TestObjectLockWithGrpc(ClusterTestBase):
     @pytest.mark.parametrize(
         "object_size",
         [pytest.lazy_fixture("simple_object_size"), pytest.lazy_fixture("complex_object_size")],
-        ids=["simple object", "complex object"],
+        ids=["simple object size", "complex object size"],
     )
     def test_should_be_possible_to_lock_multiple_objects_at_once(
         self,
         request: FixtureRequest,
         user_container: StorageContainer,
-        object_size: int,
+        object_size: ObjectSize,
     ):
         """
         Should be possible to lock multiple objects at once
@@ -368,7 +373,7 @@ class TestObjectLockWithGrpc(ClusterTestBase):
         with allure.step("Generate three objects"):
             for _ in range(3):
                 storage_objects.append(
-                    user_container.generate_object(object_size, expire_at=current_epoch + 5)
+                    user_container.generate_object(object_size.value, expire_at=current_epoch + 5)
                 )
 
         lock_object(
@@ -402,13 +407,13 @@ class TestObjectLockWithGrpc(ClusterTestBase):
     @pytest.mark.parametrize(
         "object_size",
         [pytest.lazy_fixture("simple_object_size"), pytest.lazy_fixture("complex_object_size")],
-        ids=["simple object", "complex object"],
+        ids=["simple object size", "complex object size"],
     )
     def test_already_outdated_lock_should_not_be_applied(
         self,
         request: FixtureRequest,
         user_container: StorageContainer,
-        object_size: int,
+        object_size: ObjectSize,
     ):
         """
         Already outdated lock should not be applied
@@ -419,7 +424,9 @@ class TestObjectLockWithGrpc(ClusterTestBase):
 
         current_epoch = self.ensure_fresh_epoch()
 
-        storage_object = user_container.generate_object(object_size, expire_at=current_epoch + 1)
+        storage_object = user_container.generate_object(
+            object_size.value, expire_at=current_epoch + 1
+        )
 
         expiration_epoch = current_epoch - 1
         with pytest.raises(
@@ -441,14 +448,14 @@ class TestObjectLockWithGrpc(ClusterTestBase):
     @pytest.mark.parametrize(
         "object_size",
         [pytest.lazy_fixture("simple_object_size"), pytest.lazy_fixture("complex_object_size")],
-        ids=["simple object", "complex object"],
+        ids=["simple object size", "complex object size"],
     )
     @expect_not_raises()
     def test_after_lock_expiration_with_lifetime_user_should_be_able_to_delete_object(
         self,
         request: FixtureRequest,
         user_container: StorageContainer,
-        object_size: int,
+        object_size: ObjectSize,
     ):
         """
         After lock expiration with lifetime user should be able to delete object
@@ -458,7 +465,9 @@ class TestObjectLockWithGrpc(ClusterTestBase):
         )
 
         current_epoch = self.ensure_fresh_epoch()
-        storage_object = user_container.generate_object(object_size, expire_at=current_epoch + 5)
+        storage_object = user_container.generate_object(
+            object_size.value, expire_at=current_epoch + 5
+        )
 
         lock_object(
             storage_object.wallet_file_path,
@@ -483,14 +492,14 @@ class TestObjectLockWithGrpc(ClusterTestBase):
     @pytest.mark.parametrize(
         "object_size",
         [pytest.lazy_fixture("simple_object_size"), pytest.lazy_fixture("complex_object_size")],
-        ids=["simple object", "complex object"],
+        ids=["simple object size", "complex object size"],
     )
     @expect_not_raises()
     def test_after_lock_expiration_with_expire_at_user_should_be_able_to_delete_object(
         self,
         request: FixtureRequest,
         user_container: StorageContainer,
-        object_size: int,
+        object_size: ObjectSize,
     ):
         """
         After lock expiration with expire_at user should be able to delete object
@@ -501,7 +510,9 @@ class TestObjectLockWithGrpc(ClusterTestBase):
 
         current_epoch = self.ensure_fresh_epoch()
 
-        storage_object = user_container.generate_object(object_size, expire_at=current_epoch + 5)
+        storage_object = user_container.generate_object(
+            object_size.value, expire_at=current_epoch + 5
+        )
 
         lock_object(
             storage_object.wallet_file_path,
@@ -613,7 +624,7 @@ class TestObjectLockWithGrpc(ClusterTestBase):
     @pytest.mark.parametrize(
         "new_locked_storage_object",
         [pytest.lazy_fixture("simple_object_size"), pytest.lazy_fixture("complex_object_size")],
-        ids=["simple object", "complex object"],
+        ids=["simple object size", "complex object size"],
         indirect=True,
     )
     def test_locked_object_can_be_dropped(
diff --git a/pytest_tests/testsuites/replication/test_replication.py b/pytest_tests/testsuites/replication/test_replication.py
index ca2e732..83f352f 100644
--- a/pytest_tests/testsuites/replication/test_replication.py
+++ b/pytest_tests/testsuites/replication/test_replication.py
@@ -9,6 +9,7 @@ from frostfs_testlib.steps.cli.container import create_container, delete_contain
 from frostfs_testlib.steps.cli.object import delete_object, head_object, put_object
 from frostfs_testlib.storage.cluster import Cluster
 from frostfs_testlib.storage.controllers.cluster_state_controller import ClusterStateController
+from frostfs_testlib.storage.dataclasses.object_size import ObjectSize
 from frostfs_testlib.testing.cluster_test_base import ClusterTestBase
 from frostfs_testlib.utils.file_utils import generate_file
 
@@ -29,7 +30,7 @@ class TestReplication(ClusterTestBase):
     @pytest.mark.parametrize(
         "object_size",
         [pytest.lazy_fixture("simple_object_size"), pytest.lazy_fixture("complex_object_size")],
-        ids=["simple object", "complex object"],
+        ids=["simple object size", "complex object size"],
     )
     @allure.title("Test replication")
     def test_replication(
@@ -37,7 +38,7 @@ class TestReplication(ClusterTestBase):
         default_wallet: str,
         client_shell: Shell,
         cluster: Cluster,
-        object_size,
+        object_size: ObjectSize,
         cluster_state_controller: ClusterStateController,
     ):
         nodes_count = len(cluster.cluster_nodes)
@@ -56,7 +57,7 @@ class TestReplication(ClusterTestBase):
 
         cluster_state_controller.stop_node_host(node_for_rep, mode="hard")
 
-        file_path = generate_file(object_size)
+        file_path = generate_file(object_size.value)
 
         with allure.step("Put object"):
             oid = put_object(
diff --git a/pytest_tests/testsuites/services/http_gate/test_http_bearer.py b/pytest_tests/testsuites/services/http_gate/test_http_bearer.py
index 561e65f..e772cad 100644
--- a/pytest_tests/testsuites/services/http_gate/test_http_bearer.py
+++ b/pytest_tests/testsuites/services/http_gate/test_http_bearer.py
@@ -14,6 +14,7 @@ from frostfs_testlib.steps.acl import (
 from frostfs_testlib.steps.cli.container import create_container
 from frostfs_testlib.steps.http.http_gate import upload_via_http_gate_curl, verify_object_hash
 from frostfs_testlib.storage.dataclasses.acl import EACLAccess, EACLOperation, EACLRole, EACLRule
+from frostfs_testlib.storage.dataclasses.object_size import ObjectSize
 from frostfs_testlib.testing.cluster_test_base import ClusterTestBase
 from frostfs_testlib.utils.file_utils import generate_file
 
@@ -82,12 +83,12 @@ class Test_http_bearer(ClusterTestBase):
 
     @allure.title(f"[negative] Put object without bearer token for {EACLRole.OTHERS}")
     def test_unable_put_without_bearer_token(
-        self, simple_object_size: int, user_container: str, eacl_deny_for_others
+        self, simple_object_size: ObjectSize, user_container: str, eacl_deny_for_others
     ):
         eacl_deny_for_others
         upload_via_http_gate_curl(
             cid=user_container,
-            filepath=generate_file(simple_object_size),
+            filepath=generate_file(simple_object_size.value),
             endpoint=self.cluster.default_http_gate_endpoint,
             error_pattern="access to object operation denied",
         )
@@ -96,18 +97,18 @@ class Test_http_bearer(ClusterTestBase):
     @pytest.mark.parametrize(
         "object_size",
         [pytest.lazy_fixture("simple_object_size"), pytest.lazy_fixture("complex_object_size")],
-        ids=["simple object", "complex object"],
+        ids=["simple object size", "complex object size"],
     )
     def test_put_with_bearer_when_eacl_restrict(
         self,
-        object_size: int,
+        object_size: ObjectSize,
         user_container: str,
         eacl_deny_for_others,
         bearer_token_no_limit_for_others: str,
     ):
         eacl_deny_for_others
         bearer = bearer_token_no_limit_for_others
-        file_path = generate_file(object_size)
+        file_path = generate_file(object_size.value)
         with allure.step(
             f"Put object with bearer token for {EACLRole.OTHERS}, then get and verify hashes"
         ):
diff --git a/pytest_tests/testsuites/services/http_gate/test_http_gate.py b/pytest_tests/testsuites/services/http_gate/test_http_gate.py
index 600384c..b1642f1 100644
--- a/pytest_tests/testsuites/services/http_gate/test_http_gate.py
+++ b/pytest_tests/testsuites/services/http_gate/test_http_gate.py
@@ -17,6 +17,7 @@ from frostfs_testlib.steps.http.http_gate import (
     upload_via_http_gate_curl,
     verify_object_hash,
 )
+from frostfs_testlib.storage.dataclasses.object_size import ObjectSize
 from frostfs_testlib.testing.cluster_test_base import ClusterTestBase
 from frostfs_testlib.utils.file_utils import generate_file, get_file_hash
 
@@ -43,7 +44,9 @@ class TestHttpGate(ClusterTestBase):
         TestHttpGate.wallet = default_wallet
 
     @allure.title("Test Put over gRPC, Get over HTTP")
-    def test_put_grpc_get_http(self, complex_object_size: int, simple_object_size: int):
+    def test_put_grpc_get_http(
+        self, complex_object_size: ObjectSize, simple_object_size: ObjectSize
+    ):
         """
         Test that object can be put using gRPC interface and get using HTTP.
 
@@ -65,9 +68,8 @@ class TestHttpGate(ClusterTestBase):
             rule=self.PLACEMENT_RULE_1,
             basic_acl=PUBLIC_ACL,
         )
-        file_path_simple, file_path_large = generate_file(simple_object_size), generate_file(
-            complex_object_size
-        )
+        file_path_simple = generate_file(simple_object_size.value)
+        file_path_large = generate_file(complex_object_size.value)
 
         with allure.step("Put objects using gRPC"):
             oid_simple = put_object_to_random_node(
@@ -102,7 +104,9 @@ class TestHttpGate(ClusterTestBase):
     @allure.title("Test Put over HTTP, Get over HTTP")
     @pytest.mark.skip("Skipped due to deprecated PUT via http")
     @pytest.mark.smoke
-    def test_put_http_get_http(self, complex_object_size: int, simple_object_size: int):
+    def test_put_http_get_http(
+        self, complex_object_size: ObjectSize, simple_object_size: ObjectSize
+    ):
         """
         Test that object can be put and get using HTTP interface.
 
@@ -122,9 +126,8 @@ class TestHttpGate(ClusterTestBase):
             rule=self.PLACEMENT_RULE_2,
             basic_acl=PUBLIC_ACL,
         )
-        file_path_simple, file_path_large = generate_file(simple_object_size), generate_file(
-            complex_object_size
-        )
+        file_path_simple = generate_file(simple_object_size.value)
+        file_path_large = generate_file(complex_object_size.value)
 
         with allure.step("Put objects using HTTP"):
             oid_simple = upload_via_http_gate(
@@ -161,7 +164,7 @@ class TestHttpGate(ClusterTestBase):
         ],
         ids=["simple", "hyphen", "percent"],
     )
-    def test_put_http_get_http_with_headers(self, attributes: dict, simple_object_size: int):
+    def test_put_http_get_http_with_headers(self, attributes: dict, simple_object_size: ObjectSize):
         """
         Test that object can be downloaded using different attributes in HTTP header.
 
@@ -181,7 +184,7 @@ class TestHttpGate(ClusterTestBase):
             rule=self.PLACEMENT_RULE_2,
             basic_acl=PUBLIC_ACL,
         )
-        file_path = generate_file(simple_object_size)
+        file_path = generate_file(simple_object_size.value)
 
         with allure.step("Put objects using HTTP with attribute"):
             headers = attr_into_header(attributes)
@@ -204,7 +207,7 @@ class TestHttpGate(ClusterTestBase):
     @pytest.mark.skip("Skipped due to deprecated PUT via http")
     @allure.title("Test Expiration-Epoch in HTTP header")
     @pytest.mark.parametrize("epoch_gap", [0, 1])
-    def test_expiration_epoch_in_http(self, simple_object_size: int, epoch_gap):
+    def test_expiration_epoch_in_http(self, simple_object_size: ObjectSize, epoch_gap: int):
         endpoint = self.cluster.default_rpc_endpoint
         http_endpoint = self.cluster.default_http_gate_endpoint
         min_valid_epoch = get_epoch(self.shell, self.cluster) + epoch_gap
@@ -216,7 +219,7 @@ class TestHttpGate(ClusterTestBase):
             rule=self.PLACEMENT_RULE_2,
             basic_acl=PUBLIC_ACL,
         )
-        file_path = generate_file(simple_object_size)
+        file_path = generate_file(simple_object_size.value)
         oids_to_be_expired = []
         oids_to_be_valid = []
 
@@ -269,7 +272,7 @@ class TestHttpGate(ClusterTestBase):
 
     @pytest.mark.skip("Skipped due to deprecated PUT via http")
     @allure.title("Test Zip in HTTP header")
-    def test_zip_in_http(self, complex_object_size: int, simple_object_size: int):
+    def test_zip_in_http(self, complex_object_size: ObjectSize, simple_object_size: ObjectSize):
         cid = create_container(
             self.wallet,
             shell=self.shell,
@@ -277,9 +280,8 @@ class TestHttpGate(ClusterTestBase):
             rule=self.PLACEMENT_RULE_2,
             basic_acl=PUBLIC_ACL,
         )
-        file_path_simple, file_path_large = generate_file(simple_object_size), generate_file(
-            complex_object_size
-        )
+        file_path_simple = generate_file(simple_object_size.value)
+        file_path_large = generate_file(complex_object_size.value)
         common_prefix = "my_files"
 
         headers1 = {"X-Attribute-FilePath": f"{common_prefix}/file1"}
@@ -312,7 +314,7 @@ class TestHttpGate(ClusterTestBase):
     @pytest.mark.long
     @pytest.mark.skip("Skipped due to deprecated PUT via http")
     @allure.title("Test Put over HTTP/Curl, Get over HTTP/Curl for large object")
-    def test_put_http_get_http_large_file(self, complex_object_size: int):
+    def test_put_http_get_http_large_file(self, complex_object_size: ObjectSize):
         """
         This test checks upload and download using curl with 'large' object.
         Large is object with size up to 20Mb.
@@ -325,8 +327,7 @@ class TestHttpGate(ClusterTestBase):
             basic_acl=PUBLIC_ACL,
         )
 
-        obj_size = int(os.getenv("BIG_OBJ_SIZE", complex_object_size))
-        file_path = generate_file(obj_size)
+        file_path = generate_file(complex_object_size.value)
 
         with allure.step("Put objects using HTTP"):
             oid_gate = upload_via_http_gate(
@@ -362,7 +363,9 @@ class TestHttpGate(ClusterTestBase):
 
     @pytest.mark.skip("Skipped due to deprecated PUT via http")
     @allure.title("Test Put/Get over HTTP using Curl utility")
-    def test_put_http_get_http_curl(self, complex_object_size: int, simple_object_size: int):
+    def test_put_http_get_http_curl(
+        self, complex_object_size: ObjectSize, simple_object_size: ObjectSize
+    ):
         """
         Test checks upload and download over HTTP using curl utility.
         """
@@ -373,9 +376,8 @@ class TestHttpGate(ClusterTestBase):
             rule=self.PLACEMENT_RULE_2,
             basic_acl=PUBLIC_ACL,
         )
-        file_path_simple, file_path_large = generate_file(simple_object_size), generate_file(
-            complex_object_size
-        )
+        file_path_simple = generate_file(simple_object_size.value)
+        file_path_large = generate_file(complex_object_size.value)
 
         with allure.step("Put objects using curl utility"):
             oid_simple = upload_via_http_gate_curl(
diff --git a/pytest_tests/testsuites/services/http_gate/test_http_headers.py b/pytest_tests/testsuites/services/http_gate/test_http_headers.py
index b7863e7..98d44a0 100644
--- a/pytest_tests/testsuites/services/http_gate/test_http_headers.py
+++ b/pytest_tests/testsuites/services/http_gate/test_http_headers.py
@@ -18,6 +18,7 @@ from frostfs_testlib.steps.http.http_gate import (
     try_to_get_object_via_passed_request_and_expect_error,
     upload_via_http_gate_curl,
 )
+from frostfs_testlib.storage.dataclasses.object_size import ObjectSize
 from frostfs_testlib.storage.dataclasses.storage_object_info import StorageObjectInfo
 from frostfs_testlib.testing.cluster_test_base import ClusterTestBase
 from frostfs_testlib.utils.file_utils import generate_file
@@ -51,11 +52,12 @@ class Test_http_headers(ClusterTestBase):
             # pytest.lazy_fixture("complex_object_size"),
         ],
         # TODO: Temp disable for v0.37
-        # ids=["simple object", "complex object"],
-        ids=["simple object"],
+        # ids=["simple object size", "complex object size"],
+        ids=["simple object size"],
         scope="class",
     )
     def storage_objects_with_attributes(self, request: FixtureRequest) -> list[StorageObjectInfo]:
+        object_size: ObjectSize = request.param
         storage_objects = []
         wallet = self.wallet
         cid = create_container(
@@ -65,7 +67,7 @@ class Test_http_headers(ClusterTestBase):
             rule=self.PLACEMENT_RULE,
             basic_acl=PUBLIC_ACL,
         )
-        file_path = generate_file(request.param)
+        file_path = generate_file(object_size.value)
         for attributes in self.OBJECT_ATTRIBUTES:
             storage_object_id = upload_via_http_gate_curl(
                 cid=cid,
diff --git a/pytest_tests/testsuites/services/http_gate/test_http_object.py b/pytest_tests/testsuites/services/http_gate/test_http_object.py
index 69da8d0..15a4318 100644
--- a/pytest_tests/testsuites/services/http_gate/test_http_object.py
+++ b/pytest_tests/testsuites/services/http_gate/test_http_object.py
@@ -10,6 +10,7 @@ from frostfs_testlib.steps.http.http_gate import (
     try_to_get_object_via_passed_request_and_expect_error,
     verify_object_hash,
 )
+from frostfs_testlib.storage.dataclasses.object_size import ObjectSize
 from frostfs_testlib.testing.cluster_test_base import ClusterTestBase
 from frostfs_testlib.utils.file_utils import generate_file
 
@@ -30,9 +31,9 @@ class Test_http_object(ClusterTestBase):
     @pytest.mark.parametrize(
         "object_size",
         [pytest.lazy_fixture("simple_object_size"), pytest.lazy_fixture("complex_object_size")],
-        ids=["simple object", "complex object"],
+        ids=["simple object size", "complex object size"],
     )
-    def test_object_put_get_attributes(self, object_size: int):
+    def test_object_put_get_attributes(self, object_size: ObjectSize):
         """
         Test that object can be put using gRPC interface and get using HTTP.
 
@@ -61,7 +62,7 @@ class Test_http_object(ClusterTestBase):
             )
 
         # Generate file
-        file_path = generate_file(object_size)
+        file_path = generate_file(object_size.value)
 
         # List of Key=Value attributes
         obj_key1 = "chapter1"
@@ -116,7 +117,7 @@ class Test_http_object(ClusterTestBase):
                 cid=cid,
                 attrs=attrs,
                 endpoint=self.cluster.default_http_gate_endpoint,
-                hostname=self.cluster.default_http_hostname,
+                http_hostname=self.cluster.default_http_hostname,
             )
         with allure.step("[Negative] try to get object: get_by_attribute/$CID/$OID"):
             request = f"/get_by_attribute/{cid}/{oid}"
diff --git a/pytest_tests/testsuites/services/http_gate/test_http_streaming.py b/pytest_tests/testsuites/services/http_gate/test_http_streaming.py
index 011b929..fdd9477 100644
--- a/pytest_tests/testsuites/services/http_gate/test_http_streaming.py
+++ b/pytest_tests/testsuites/services/http_gate/test_http_streaming.py
@@ -5,6 +5,7 @@ import pytest
 from frostfs_testlib.resources.wellknown_acl import PUBLIC_ACL
 from frostfs_testlib.steps.cli.container import create_container
 from frostfs_testlib.steps.http.http_gate import upload_via_http_gate_curl, verify_object_hash
+from frostfs_testlib.storage.dataclasses.object_size import ObjectSize
 from frostfs_testlib.testing.cluster_test_base import ClusterTestBase
 from frostfs_testlib.utils.file_utils import generate_file
 
@@ -25,10 +26,10 @@ class Test_http_streaming(ClusterTestBase):
     @pytest.mark.parametrize(
         "object_size",
         [pytest.lazy_fixture("complex_object_size")],
-        ids=["complex object"],
+        ids=["complex object size"],
     )
     @pytest.mark.skip("Skipped due to deprecated PUT via http")
-    def test_object_can_be_put_get_by_streaming(self, object_size: int):
+    def test_object_can_be_put_get_by_streaming(self, object_size: ObjectSize):
         """
         Test that object can be put using gRPC interface and get using HTTP.
 
@@ -51,7 +52,7 @@ class Test_http_streaming(ClusterTestBase):
             )
         with allure.step("Allocate big object"):
             # Generate file
-            file_path = generate_file(object_size)
+            file_path = generate_file(object_size.value)
 
         with allure.step(
             "Put objects using curl utility and Get object and verify hashes [ get/$CID/$OID ]"
diff --git a/pytest_tests/testsuites/services/http_gate/test_http_system_header.py b/pytest_tests/testsuites/services/http_gate/test_http_system_header.py
index 4ef6551..cc40358 100644
--- a/pytest_tests/testsuites/services/http_gate/test_http_system_header.py
+++ b/pytest_tests/testsuites/services/http_gate/test_http_system_header.py
@@ -20,6 +20,7 @@ from frostfs_testlib.steps.http.http_gate import (
     upload_via_http_gate_curl,
     verify_object_hash,
 )
+from frostfs_testlib.storage.dataclasses.object_size import ObjectSize
 from frostfs_testlib.testing.cluster_test_base import ClusterTestBase
 from frostfs_testlib.utils.file_utils import generate_file
 
@@ -142,11 +143,11 @@ class Test_http_system_header(ClusterTestBase):
         return oid, head
 
     @allure.title("[negative] attempt to put object with expired epoch")
-    def test_unable_put_expired_epoch(self, user_container: str, simple_object_size: int):
+    def test_unable_put_expired_epoch(self, user_container: str, simple_object_size: ObjectSize):
         headers = attr_into_str_header_curl(
             {"System-Expiration-Epoch": str(get_epoch(self.shell, self.cluster) - 1)}
         )
-        file_path = generate_file(simple_object_size)
+        file_path = generate_file(simple_object_size.value)
         with allure.step(
             "Put object using HTTP with attribute Expiration-Epoch where epoch is expired"
         ):
@@ -159,9 +160,11 @@ class Test_http_system_header(ClusterTestBase):
             )
 
     @allure.title("[negative] attempt to put object with negative System-Expiration-Duration")
-    def test_unable_put_negative_duration(self, user_container: str, simple_object_size: int):
+    def test_unable_put_negative_duration(
+        self, user_container: str, simple_object_size: ObjectSize
+    ):
         headers = attr_into_str_header_curl({"System-Expiration-Duration": "-1h"})
-        file_path = generate_file(simple_object_size)
+        file_path = generate_file(simple_object_size.value)
         with allure.step(
             "Put object using HTTP with attribute System-Expiration-Duration where duration is negative"
         ):
@@ -176,9 +179,11 @@ class Test_http_system_header(ClusterTestBase):
     @allure.title(
         "[negative] attempt to put object with System-Expiration-Timestamp value in the past"
     )
-    def test_unable_put_expired_timestamp(self, user_container: str, simple_object_size: int):
+    def test_unable_put_expired_timestamp(
+        self, user_container: str, simple_object_size: ObjectSize
+    ):
         headers = attr_into_str_header_curl({"System-Expiration-Timestamp": "1635075727"})
-        file_path = generate_file(simple_object_size)
+        file_path = generate_file(simple_object_size.value)
         with allure.step(
             "Put object using HTTP with attribute System-Expiration-Timestamp where duration is in the past"
         ):
@@ -193,9 +198,9 @@ class Test_http_system_header(ClusterTestBase):
     @allure.title(
         "[negative] Put object using HTTP with attribute System-Expiration-RFC3339 where duration is in the past"
     )
-    def test_unable_put_expired_rfc(self, user_container: str, simple_object_size: int):
+    def test_unable_put_expired_rfc(self, user_container: str, simple_object_size: ObjectSize):
         headers = attr_into_str_header_curl({"System-Expiration-RFC3339": "2021-11-22T09:55:49Z"})
-        file_path = generate_file(simple_object_size)
+        file_path = generate_file(simple_object_size.value)
         upload_via_http_gate_curl(
             cid=user_container,
             filepath=file_path,
@@ -208,11 +213,11 @@ class Test_http_system_header(ClusterTestBase):
     @pytest.mark.parametrize(
         "object_size",
         [pytest.lazy_fixture("simple_object_size"), pytest.lazy_fixture("complex_object_size")],
-        ids=["simple object", "complex object"],
+        ids=["simple object size", "complex object size"],
     )
     @pytest.mark.skip("Temp disable for v0.37")
     def test_http_attr_priority_epoch_duration(
-        self, user_container: str, object_size: int, epoch_duration: int
+        self, user_container: str, object_size: ObjectSize, epoch_duration: int
     ):
         self.tick_epoch()
         epoch_count = 1
@@ -221,7 +226,7 @@ class Test_http_system_header(ClusterTestBase):
             f"epoch duration={epoch_duration}, current_epoch= {get_epoch(self.shell, self.cluster)} expected_epoch {expected_epoch}"
         )
         attributes = {SYSTEM_EXPIRATION_EPOCH: expected_epoch, SYSTEM_EXPIRATION_DURATION: "1m"}
-        file_path = generate_file(object_size)
+        file_path = generate_file(object_size.value)
         with allure.step(
             f"Put objects using HTTP with attributes and head command should display {EXPIRATION_EPOCH_HEADER}: {expected_epoch} attr"
         ):
@@ -257,11 +262,11 @@ class Test_http_system_header(ClusterTestBase):
     @pytest.mark.parametrize(
         "object_size",
         [pytest.lazy_fixture("simple_object_size"), pytest.lazy_fixture("complex_object_size")],
-        ids=["simple object", "complex object"],
+        ids=["simple object size", "complex object size"],
     )
     @pytest.mark.skip("Temp disable for v0.37")
     def test_http_attr_priority_dur_timestamp(
-        self, user_container: str, object_size: int, epoch_duration: int
+        self, user_container: str, object_size: ObjectSize, epoch_duration: int
     ):
         self.tick_epoch()
         epoch_count = 2
@@ -277,7 +282,7 @@ class Test_http_system_header(ClusterTestBase):
                 epoch_duration=epoch_duration, epoch=1
             ),
         }
-        file_path = generate_file(object_size)
+        file_path = generate_file(object_size.value)
         with allure.step(
             f"Put objects using HTTP with attributes and head command should display {EXPIRATION_EPOCH_HEADER}: {expected_epoch} attr"
         ):
@@ -313,11 +318,11 @@ class Test_http_system_header(ClusterTestBase):
     @pytest.mark.parametrize(
         "object_size",
         [pytest.lazy_fixture("simple_object_size"), pytest.lazy_fixture("complex_object_size")],
-        ids=["simple object", "complex object"],
+        ids=["simple object size", "complex object size"],
     )
     @pytest.mark.skip("Temp disable for v0.37")
     def test_http_attr_priority_timestamp_rfc(
-        self, user_container: str, object_size: int, epoch_duration: int
+        self, user_container: str, object_size: ObjectSize, epoch_duration: int
     ):
         self.tick_epoch()
         epoch_count = 2
@@ -333,7 +338,7 @@ class Test_http_system_header(ClusterTestBase):
                 epoch_duration=epoch_duration, epoch=1, rfc3339=True
             ),
         }
-        file_path = generate_file(object_size)
+        file_path = generate_file(object_size.value)
         with allure.step(
             f"Put objects using HTTP with attributes and head command should display {EXPIRATION_EPOCH_HEADER}: {expected_epoch} attr"
         ):
@@ -369,11 +374,11 @@ class Test_http_system_header(ClusterTestBase):
         # TODO: Temp disabled for v0.37
         # [pytest.lazy_fixture("simple_object_size"), pytest.lazy_fixture("complex_object_size")],
         [pytest.lazy_fixture("simple_object_size")],
-        # ids=["simple object", "complex object"],
-        ids=["simple object"],
+        # ids=["simple object size", "complex object size"],
+        ids=["simple object size"],
     )
     def test_http_rfc_object_unavailable_after_expir(
-        self, user_container: str, object_size: int, epoch_duration: int
+        self, user_container: str, object_size: ObjectSize, epoch_duration: int
     ):
         self.tick_epoch()
         epoch_count = 2
@@ -386,7 +391,7 @@ class Test_http_system_header(ClusterTestBase):
                 epoch_duration=epoch_duration, epoch=2, rfc3339=True
             )
         }
-        file_path = generate_file(object_size)
+        file_path = generate_file(object_size.value)
         with allure.step(
             f"Put objects using HTTP with attributes and head command should display {EXPIRATION_EPOCH_HEADER}: {expected_epoch} attr"
         ):
diff --git a/pytest_tests/testsuites/services/s3_gate/test_s3_ACL.py b/pytest_tests/testsuites/services/s3_gate/test_s3_ACL.py
index 1a89717..de68587 100644
--- a/pytest_tests/testsuites/services/s3_gate/test_s3_ACL.py
+++ b/pytest_tests/testsuites/services/s3_gate/test_s3_ACL.py
@@ -2,6 +2,7 @@ import allure
 import pytest
 from frostfs_testlib.s3 import AwsCliClient, Boto3ClientWrapper, S3ClientWrapper
 from frostfs_testlib.steps.s3 import s3_helper
+from frostfs_testlib.storage.dataclasses.object_size import ObjectSize
 from frostfs_testlib.utils.file_utils import generate_file
 
 
@@ -11,8 +12,10 @@ from frostfs_testlib.utils.file_utils import generate_file
 class TestS3GateACL:
     @allure.title("Test S3: Object ACL")
     @pytest.mark.parametrize("s3_client", [AwsCliClient], indirect=True)
-    def test_s3_object_ACL(self, s3_client: S3ClientWrapper, bucket: str, simple_object_size: int):
-        file_path = generate_file(simple_object_size)
+    def test_s3_object_ACL(
+        self, s3_client: S3ClientWrapper, bucket: str, simple_object_size: ObjectSize
+    ):
+        file_path = generate_file(simple_object_size.value)
         file_name = s3_helper.object_key_from_file_path(file_path)
 
         with allure.step("Put object into bucket, Check ACL is empty"):
diff --git a/pytest_tests/testsuites/services/s3_gate/test_s3_bucket.py b/pytest_tests/testsuites/services/s3_gate/test_s3_bucket.py
index 270d8fc..7a6e0d6 100644
--- a/pytest_tests/testsuites/services/s3_gate/test_s3_bucket.py
+++ b/pytest_tests/testsuites/services/s3_gate/test_s3_bucket.py
@@ -4,6 +4,7 @@ import allure
 import pytest
 from frostfs_testlib.s3 import AwsCliClient, Boto3ClientWrapper, S3ClientWrapper
 from frostfs_testlib.steps.s3 import s3_helper
+from frostfs_testlib.storage.dataclasses.object_size import ObjectSize
 from frostfs_testlib.utils.file_utils import generate_file
 
 
@@ -73,8 +74,10 @@ class TestS3GateBucket:
             s3_helper.assert_s3_acl(acl_grants=bucket_acl_2, permitted_users="AllUsers")
 
     @allure.title("Test S3: create bucket with object lock")
-    def test_s3_bucket_object_lock(self, s3_client: S3ClientWrapper, simple_object_size: int):
-        file_path = generate_file(simple_object_size)
+    def test_s3_bucket_object_lock(
+        self, s3_client: S3ClientWrapper, simple_object_size: ObjectSize
+    ):
+        file_path = generate_file(simple_object_size.value)
         file_name = s3_helper.object_key_from_file_path(file_path)
 
         with allure.step("Create bucket with --no-object-lock-enabled-for-bucket"):
@@ -106,10 +109,10 @@ class TestS3GateBucket:
             )
 
     @allure.title("Test S3: delete bucket")
-    def test_s3_delete_bucket(self, s3_client: S3ClientWrapper, simple_object_size: int):
-        file_path_1 = generate_file(simple_object_size)
+    def test_s3_delete_bucket(self, s3_client: S3ClientWrapper, simple_object_size: ObjectSize):
+        file_path_1 = generate_file(simple_object_size.value)
         file_name_1 = s3_helper.object_key_from_file_path(file_path_1)
-        file_path_2 = generate_file(simple_object_size)
+        file_path_2 = generate_file(simple_object_size.value)
         file_name_2 = s3_helper.object_key_from_file_path(file_path_2)
         bucket = s3_client.create_bucket()
 
diff --git a/pytest_tests/testsuites/services/s3_gate/test_s3_gate.py b/pytest_tests/testsuites/services/s3_gate/test_s3_gate.py
index 407de89..d6e3538 100644
--- a/pytest_tests/testsuites/services/s3_gate/test_s3_gate.py
+++ b/pytest_tests/testsuites/services/s3_gate/test_s3_gate.py
@@ -10,6 +10,7 @@ from frostfs_testlib.shell import Shell
 from frostfs_testlib.steps.epoch import tick_epoch
 from frostfs_testlib.steps.s3 import s3_helper
 from frostfs_testlib.storage.cluster import Cluster
+from frostfs_testlib.storage.dataclasses.object_size import ObjectSize
 from frostfs_testlib.utils.file_utils import (
     generate_file,
     generate_file_with_content,
@@ -39,13 +40,13 @@ class TestS3Gate:
         s3_client: S3ClientWrapper,
         client_shell: Shell,
         cluster: Cluster,
-        simple_object_size: int,
+        simple_object_size: ObjectSize,
     ):
         """
         Test base S3 Bucket API (Create/List/Head/Delete).
         """
 
-        file_path = generate_file(simple_object_size)
+        file_path = generate_file(simple_object_size.value)
         file_name = s3_helper.object_key_from_file_path(file_path)
 
         with allure.step("Create buckets"):
@@ -108,22 +109,23 @@ class TestS3Gate:
 
     @allure.title("Test S3 Object API")
     @pytest.mark.parametrize(
-        "file_type", ["simple", "large"], ids=["Simple object", "Large object"]
+        "object_size",
+        ["simple object size", "complex object size"],
+        ids=["simple object size", "complex object size"],
     )
     def test_s3_api_object(
         self,
         s3_client: S3ClientWrapper,
-        file_type: str,
+        object_size: str,
         two_buckets: tuple[str, str],
-        simple_object_size: int,
-        complex_object_size: int,
+        simple_object_size: ObjectSize,
+        complex_object_size: ObjectSize,
     ):
         """
-        Test base S3 Object API (Put/Head/List) for simple and large objects.
+        Test base S3 Object API (Put/Head/List) for simple and complex objects.
         """
-        file_path = generate_file(
-            simple_object_size if file_type == "simple" else complex_object_size
-        )
+        size = simple_object_size if object_size == "simple object size" else complex_object_size
+        file_path = generate_file(size.value)
         file_name = s3_helper.object_key_from_file_path(file_path)
 
         bucket_1, bucket_2 = two_buckets
@@ -146,7 +148,9 @@ class TestS3Gate:
                 s3_client.get_object_attributes(bucket, file_name, attrs)
 
     @allure.title("Test S3 Sync directory")
-    def test_s3_sync_dir(self, s3_client: S3ClientWrapper, bucket: str, simple_object_size: int):
+    def test_s3_sync_dir(
+        self, s3_client: S3ClientWrapper, bucket: str, simple_object_size: ObjectSize
+    ):
         """
         Test checks sync directory with AWS CLI utility.
         """
@@ -157,8 +161,8 @@ class TestS3Gate:
         if not isinstance(s3_client, AwsCliClient):
             pytest.skip("This test is not supported with boto3 client")
 
-        generate_file_with_content(simple_object_size, file_path=file_path_1)
-        generate_file_with_content(simple_object_size, file_path=file_path_2)
+        generate_file_with_content(simple_object_size.value, file_path=file_path_1)
+        generate_file_with_content(simple_object_size.value, file_path=file_path_2)
 
         s3_client.sync(bucket=bucket, dir_path=os.path.dirname(file_path_1))
 
@@ -177,21 +181,23 @@ class TestS3Gate:
 
     @allure.title("Test S3 Object versioning")
     def test_s3_api_versioning(
-        self, s3_client: S3ClientWrapper, bucket: str, simple_object_size: int
+        self, s3_client: S3ClientWrapper, bucket: str, simple_object_size: ObjectSize
     ):
         """
         Test checks basic versioning functionality for S3 bucket.
         """
         version_1_content = "Version 1"
         version_2_content = "Version 2"
-        file_name_simple = generate_file_with_content(simple_object_size, content=version_1_content)
+        file_name_simple = generate_file_with_content(
+            simple_object_size.value, content=version_1_content
+        )
         obj_key = os.path.basename(file_name_simple)
         s3_helper.set_bucket_versioning(s3_client, bucket, VersioningStatus.ENABLED)
 
         with allure.step("Put several versions of object into bucket"):
             version_id_1 = s3_client.put_object(bucket, file_name_simple)
             generate_file_with_content(
-                simple_object_size, file_path=file_name_simple, content=version_2_content
+                simple_object_size.value, file_path=file_name_simple, content=version_2_content
             )
             version_id_2 = s3_client.put_object(bucket, file_name_simple)
 
@@ -255,7 +261,7 @@ class TestS3Gate:
     @pytest.mark.s3_gate_multipart
     @allure.title("Test S3 Object Multipart API")
     def test_s3_api_multipart(
-        self, s3_client: S3ClientWrapper, bucket: str, simple_object_size: int
+        self, s3_client: S3ClientWrapper, bucket: str, simple_object_size: ObjectSize
     ):
         """
         Test checks S3 Multipart API (Create multipart upload/Abort multipart upload/List multipart upload/
@@ -263,7 +269,7 @@ class TestS3Gate:
         """
         parts_count = 3
         file_name_large = generate_file(
-            simple_object_size * 1024 * 6 * parts_count
+            simple_object_size.value * 1024 * 6 * parts_count
         )  # 5Mb - min part
         object_key = s3_helper.object_key_from_file_path(file_name_large)
         part_files = split_file(file_name_large, parts_count)
@@ -325,7 +331,7 @@ class TestS3Gate:
 
     @allure.title("Test S3 Object tagging API")
     def test_s3_api_object_tagging(
-        self, s3_client: S3ClientWrapper, bucket: str, simple_object_size: int
+        self, s3_client: S3ClientWrapper, bucket: str, simple_object_size: ObjectSize
     ):
         """
         Test checks S3 Object tagging API (Put tag/Get tag/Update tag).
@@ -336,7 +342,7 @@ class TestS3Gate:
             ("some-key--obj2", "some-value--obj2"),
         ]
         key_value_pair_obj_new = [("some-key-obj-new", "some-value-obj-new")]
-        file_name_simple = generate_file(simple_object_size)
+        file_name_simple = generate_file(simple_object_size.value)
         obj_key = s3_helper.object_key_from_file_path(file_name_simple)
 
         s3_client.put_bucket_tagging(bucket, key_value_pair_bucket)
@@ -360,8 +366,8 @@ class TestS3Gate:
         self,
         s3_client: S3ClientWrapper,
         two_buckets: tuple[str, str],
-        simple_object_size: int,
-        complex_object_size: int,
+        simple_object_size: ObjectSize,
+        complex_object_size: ObjectSize,
     ):
         """
         Check delete_object and delete_objects S3 API operation. From first bucket some objects deleted one by one.
@@ -377,7 +383,7 @@ class TestS3Gate:
 
         with allure.step(f"Generate {max_obj_count} files"):
             for _ in range(max_obj_count):
-                file_paths.append(generate_file(choice(obj_sizes)))
+                file_paths.append(generate_file(choice(obj_sizes).value))
 
         for bucket in (bucket_1, bucket_2):
             with allure.step(f"Bucket {bucket} must be empty as it just created"):
@@ -426,16 +432,15 @@ class TestS3Gate:
         self,
         s3_client: S3ClientWrapper,
         bucket: str,
-        complex_object_size: int,
-        simple_object_size: int,
+        complex_object_size: ObjectSize,
+        simple_object_size: ObjectSize,
     ):
         """
         Test object can be copied to the same bucket.
         #TODO: delete after test_s3_copy_object will be merge
         """
-        file_path_simple, file_path_large = generate_file(simple_object_size), generate_file(
-            complex_object_size
-        )
+        file_path_simple = generate_file(simple_object_size.value)
+        file_path_large = generate_file(complex_object_size.value)
         file_name_simple = s3_helper.object_key_from_file_path(file_path_simple)
         file_name_large = s3_helper.object_key_from_file_path(file_path_large)
         bucket_objects = [file_name_simple, file_name_large]
@@ -476,16 +481,15 @@ class TestS3Gate:
         self,
         s3_client: S3ClientWrapper,
         two_buckets: tuple[str, str],
-        complex_object_size: int,
-        simple_object_size: int,
+        complex_object_size: ObjectSize,
+        simple_object_size: ObjectSize,
     ):
         """
         Test object can be copied to another bucket.
         #TODO: delete after test_s3_copy_object will be merge
         """
-        file_path_simple, file_path_large = generate_file(simple_object_size), generate_file(
-            complex_object_size
-        )
+        file_path_simple = generate_file(simple_object_size.value)
+        file_path_large = generate_file(complex_object_size.value)
         file_name_simple = s3_helper.object_key_from_file_path(file_path_simple)
         file_name_large = s3_helper.object_key_from_file_path(file_path_large)
         bucket_1_objects = [file_name_simple, file_name_large]
diff --git a/pytest_tests/testsuites/services/s3_gate/test_s3_locking.py b/pytest_tests/testsuites/services/s3_gate/test_s3_locking.py
index 9e7e334..cad4e13 100644
--- a/pytest_tests/testsuites/services/s3_gate/test_s3_locking.py
+++ b/pytest_tests/testsuites/services/s3_gate/test_s3_locking.py
@@ -5,6 +5,7 @@ import allure
 import pytest
 from frostfs_testlib.s3 import AwsCliClient, Boto3ClientWrapper, S3ClientWrapper
 from frostfs_testlib.steps.s3 import s3_helper
+from frostfs_testlib.storage.dataclasses.object_size import ObjectSize
 from frostfs_testlib.utils.file_utils import generate_file, generate_file_with_content
 
 
@@ -20,9 +21,9 @@ def pytest_generate_tests(metafunc: pytest.Metafunc):
 class TestS3GateLocking:
     @allure.title("Test S3: Checking the operation of retention period & legal lock on the object")
     def test_s3_object_locking(
-        self, s3_client: S3ClientWrapper, version_id: str, simple_object_size: int
+        self, s3_client: S3ClientWrapper, version_id: str, simple_object_size: ObjectSize
     ):
-        file_path = generate_file(simple_object_size)
+        file_path = generate_file(simple_object_size.value)
         file_name = s3_helper.object_key_from_file_path(file_path)
         retention_period = 2
 
@@ -30,7 +31,7 @@ class TestS3GateLocking:
 
         with allure.step("Put several versions of object into bucket"):
             s3_client.put_object(bucket, file_path)
-            file_name_1 = generate_file_with_content(simple_object_size, file_path=file_path)
+            file_name_1 = generate_file_with_content(simple_object_size.value, file_path=file_path)
             version_id_2 = s3_client.put_object(bucket, file_name_1)
             s3_helper.check_objects_in_bucket(s3_client, bucket, [file_name])
             if version_id:
@@ -75,9 +76,9 @@ class TestS3GateLocking:
 
     @allure.title("Test S3: Checking the impossibility to change the retention mode COMPLIANCE")
     def test_s3_mode_compliance(
-        self, s3_client: S3ClientWrapper, version_id: str, simple_object_size: int
+        self, s3_client: S3ClientWrapper, version_id: str, simple_object_size: ObjectSize
     ):
-        file_path = generate_file(simple_object_size)
+        file_path = generate_file(simple_object_size.value)
         file_name = s3_helper.object_key_from_file_path(file_path)
         retention_period = 2
         retention_period_1 = 1
@@ -114,9 +115,9 @@ class TestS3GateLocking:
 
     @allure.title("Test S3: Checking the ability to change retention mode GOVERNANCE")
     def test_s3_mode_governance(
-        self, s3_client: S3ClientWrapper, version_id: str, simple_object_size: int
+        self, s3_client: S3ClientWrapper, version_id: str, simple_object_size: ObjectSize
     ):
-        file_path = generate_file(simple_object_size)
+        file_path = generate_file(simple_object_size.value)
         file_name = s3_helper.object_key_from_file_path(file_path)
         retention_period = 3
         retention_period_1 = 2
@@ -176,9 +177,9 @@ class TestS3GateLocking:
 
     @allure.title("Test S3: Checking if an Object Cannot Be Locked")
     def test_s3_legal_hold(
-        self, s3_client: S3ClientWrapper, version_id: str, simple_object_size: int
+        self, s3_client: S3ClientWrapper, version_id: str, simple_object_size: ObjectSize
     ):
-        file_path = generate_file(simple_object_size)
+        file_path = generate_file(simple_object_size.value)
         file_name = s3_helper.object_key_from_file_path(file_path)
 
         bucket = s3_client.create_bucket(object_lock_enabled_for_bucket=False)
@@ -197,8 +198,8 @@ class TestS3GateLocking:
 @pytest.mark.s3_gate
 class TestS3GateLockingBucket:
     @allure.title("Test S3: Bucket Lock")
-    def test_s3_bucket_lock(self, s3_client: S3ClientWrapper, simple_object_size: int):
-        file_path = generate_file(simple_object_size)
+    def test_s3_bucket_lock(self, s3_client: S3ClientWrapper, simple_object_size: ObjectSize):
+        file_path = generate_file(simple_object_size.value)
         file_name = s3_helper.object_key_from_file_path(file_path)
         configuration = {"Rule": {"DefaultRetention": {"Mode": "COMPLIANCE", "Days": 1}}}
 
diff --git a/pytest_tests/testsuites/services/s3_gate/test_s3_multipart.py b/pytest_tests/testsuites/services/s3_gate/test_s3_multipart.py
index 8afc007..e184b16 100644
--- a/pytest_tests/testsuites/services/s3_gate/test_s3_multipart.py
+++ b/pytest_tests/testsuites/services/s3_gate/test_s3_multipart.py
@@ -3,6 +3,7 @@ import pytest
 from frostfs_testlib.s3 import AwsCliClient, Boto3ClientWrapper, S3ClientWrapper, VersioningStatus
 from frostfs_testlib.steps.cli.container import list_objects, search_container_by_name
 from frostfs_testlib.steps.s3 import s3_helper
+from frostfs_testlib.storage.dataclasses.object_size import ObjectSize
 from frostfs_testlib.testing.cluster_test_base import ClusterTestBase
 from frostfs_testlib.utils.file_utils import generate_file, get_file_hash, split_file
 
@@ -64,11 +65,11 @@ class TestS3GateMultipart(ClusterTestBase):
         s3_client: S3ClientWrapper,
         default_wallet: str,
         bucket: str,
-        simple_object_size: int,
-        complex_object_size: int,
+        simple_object_size: ObjectSize,
+        complex_object_size: ObjectSize,
     ):
-        complex_file = generate_file(complex_object_size)
-        simple_file = generate_file(simple_object_size)
+        complex_file = generate_file(complex_object_size.value)
+        simple_file = generate_file(simple_object_size.value)
         to_upload = [complex_file, complex_file, simple_file]
         files_count = len(to_upload)
         upload_key = "multipart_abort"
diff --git a/pytest_tests/testsuites/services/s3_gate/test_s3_object.py b/pytest_tests/testsuites/services/s3_gate/test_s3_object.py
index 4c7b831..cb75178 100644
--- a/pytest_tests/testsuites/services/s3_gate/test_s3_object.py
+++ b/pytest_tests/testsuites/services/s3_gate/test_s3_object.py
@@ -11,6 +11,7 @@ from frostfs_testlib.resources.common import ASSETS_DIR, DEFAULT_WALLET_PASS
 from frostfs_testlib.resources.error_patterns import S3_MALFORMED_XML_REQUEST
 from frostfs_testlib.s3 import AwsCliClient, Boto3ClientWrapper, S3ClientWrapper, VersioningStatus
 from frostfs_testlib.steps.s3 import s3_helper
+from frostfs_testlib.storage.dataclasses.object_size import ObjectSize
 from frostfs_testlib.testing.test_control import expect_not_raises
 from frostfs_testlib.utils import wallet_utils
 from frostfs_testlib.utils.file_utils import (
@@ -68,9 +69,12 @@ class TestS3GateObject:
 
     @allure.title("Test S3: Copy object")
     def test_s3_copy_object(
-        self, s3_client: S3ClientWrapper, two_buckets: tuple[str, str], simple_object_size: int
+        self,
+        s3_client: S3ClientWrapper,
+        two_buckets: tuple[str, str],
+        simple_object_size: ObjectSize,
     ):
-        file_path = generate_file(simple_object_size)
+        file_path = generate_file(simple_object_size.value)
         file_name = s3_helper.object_key_from_file_path(file_path)
         bucket_1_objects = [file_name]
 
@@ -121,10 +125,15 @@ class TestS3GateObject:
 
     @allure.title("Test S3: Copy version of object")
     def test_s3_copy_version_object(
-        self, s3_client: S3ClientWrapper, two_buckets: tuple[str, str], simple_object_size: int
+        self,
+        s3_client: S3ClientWrapper,
+        two_buckets: tuple[str, str],
+        simple_object_size: ObjectSize,
     ):
         version_1_content = "Version 1"
-        file_name_simple = generate_file_with_content(simple_object_size, content=version_1_content)
+        file_name_simple = generate_file_with_content(
+            simple_object_size.value, content=version_1_content
+        )
         obj_key = os.path.basename(file_name_simple)
 
         bucket_1, bucket_2 = two_buckets
@@ -162,9 +171,13 @@ class TestS3GateObject:
                 s3_client.copy_object(bucket_1, obj_key)
 
     @allure.title("Test S3: Checking copy with acl")
-    def test_s3_copy_acl(self, s3_client: S3ClientWrapper, bucket: str, simple_object_size: int):
+    def test_s3_copy_acl(
+        self, s3_client: S3ClientWrapper, bucket: str, simple_object_size: ObjectSize
+    ):
         version_1_content = "Version 1"
-        file_name_simple = generate_file_with_content(simple_object_size, content=version_1_content)
+        file_name_simple = generate_file_with_content(
+            simple_object_size.value, content=version_1_content
+        )
         obj_key = os.path.basename(file_name_simple)
 
         s3_helper.set_bucket_versioning(s3_client, bucket, VersioningStatus.ENABLED)
@@ -180,10 +193,10 @@ class TestS3GateObject:
 
     @allure.title("Test S3: Copy object with metadata")
     def test_s3_copy_metadate(
-        self, s3_client: S3ClientWrapper, bucket: str, simple_object_size: int
+        self, s3_client: S3ClientWrapper, bucket: str, simple_object_size: ObjectSize
     ):
         object_metadata = {f"{uuid.uuid4()}": f"{uuid.uuid4()}"}
-        file_path = generate_file(simple_object_size)
+        file_path = generate_file(simple_object_size.value)
         file_name = s3_helper.object_key_from_file_path(file_path)
         bucket_1_objects = [file_name]
 
@@ -227,10 +240,10 @@ class TestS3GateObject:
 
     @allure.title("Test S3: Copy object with tagging")
     def test_s3_copy_tagging(
-        self, s3_client: S3ClientWrapper, bucket: str, simple_object_size: int
+        self, s3_client: S3ClientWrapper, bucket: str, simple_object_size: ObjectSize
     ):
         object_tagging = [(f"{uuid.uuid4()}", f"{uuid.uuid4()}")]
-        file_path = generate_file(simple_object_size)
+        file_path = generate_file(simple_object_size.value)
         file_name_simple = s3_helper.object_key_from_file_path(file_path)
         bucket_1_objects = [file_name_simple]
 
@@ -281,12 +294,14 @@ class TestS3GateObject:
         self,
         s3_client: S3ClientWrapper,
         bucket: str,
-        simple_object_size: int,
-        complex_object_size: int,
+        simple_object_size: ObjectSize,
+        complex_object_size: ObjectSize,
     ):
         version_1_content = "Version 1"
         version_2_content = "Version 2"
-        file_name_simple = generate_file_with_content(simple_object_size, content=version_1_content)
+        file_name_simple = generate_file_with_content(
+            simple_object_size.value, content=version_1_content
+        )
 
         obj_key = os.path.basename(file_name_simple)
         s3_helper.set_bucket_versioning(s3_client, bucket, VersioningStatus.ENABLED)
@@ -294,7 +309,7 @@ class TestS3GateObject:
         with allure.step("Put several versions of object into bucket"):
             version_id_1 = s3_client.put_object(bucket, file_name_simple)
             file_name_1 = generate_file_with_content(
-                simple_object_size, file_path=file_name_simple, content=version_2_content
+                simple_object_size.value, file_path=file_name_simple, content=version_2_content
             )
             version_id_2 = s3_client.put_object(bucket, file_name_1)
 
@@ -327,7 +342,7 @@ class TestS3GateObject:
             assert "DeleteMarker" not in delete_obj.keys(), "Delete markers should not be created"
 
         with allure.step("Put new object into bucket"):
-            file_name_simple = generate_file(complex_object_size)
+            file_name_simple = generate_file(complex_object_size.value)
             obj_key = os.path.basename(file_name_simple)
             s3_client.put_object(bucket, file_name_simple)
 
@@ -339,13 +354,15 @@ class TestS3GateObject:
 
     @allure.title("Test S3: bulk delete version of object")
     def test_s3_bulk_delete_versioning(
-        self, s3_client: S3ClientWrapper, bucket: str, simple_object_size: int
+        self, s3_client: S3ClientWrapper, bucket: str, simple_object_size: ObjectSize
     ):
         version_1_content = "Version 1"
         version_2_content = "Version 2"
         version_3_content = "Version 3"
         version_4_content = "Version 4"
-        file_name_1 = generate_file_with_content(simple_object_size, content=version_1_content)
+        file_name_1 = generate_file_with_content(
+            simple_object_size.value, content=version_1_content
+        )
 
         obj_key = os.path.basename(file_name_1)
         s3_helper.set_bucket_versioning(s3_client, bucket, VersioningStatus.ENABLED)
@@ -353,15 +370,15 @@ class TestS3GateObject:
         with allure.step("Put several versions of object into bucket"):
             version_id_1 = s3_client.put_object(bucket, file_name_1)
             file_name_2 = generate_file_with_content(
-                simple_object_size, file_path=file_name_1, content=version_2_content
+                simple_object_size.value, file_path=file_name_1, content=version_2_content
             )
             version_id_2 = s3_client.put_object(bucket, file_name_2)
             file_name_3 = generate_file_with_content(
-                simple_object_size, file_path=file_name_1, content=version_3_content
+                simple_object_size.value, file_path=file_name_1, content=version_3_content
             )
             version_id_3 = s3_client.put_object(bucket, file_name_3)
             file_name_4 = generate_file_with_content(
-                simple_object_size, file_path=file_name_1, content=version_4_content
+                simple_object_size.value, file_path=file_name_1, content=version_4_content
             )
             version_id_4 = s3_client.put_object(bucket, file_name_4)
             version_ids = {version_id_1, version_id_2, version_id_3, version_id_4}
@@ -392,18 +409,20 @@ class TestS3GateObject:
 
     @allure.title("Test S3: Get versions of object")
     def test_s3_get_versioning(
-        self, s3_client: S3ClientWrapper, bucket: str, simple_object_size: int
+        self, s3_client: S3ClientWrapper, bucket: str, simple_object_size: ObjectSize
     ):
         version_1_content = "Version 1"
         version_2_content = "Version 2"
-        file_name_simple = generate_file_with_content(simple_object_size, content=version_1_content)
+        file_name_simple = generate_file_with_content(
+            simple_object_size.value, content=version_1_content
+        )
 
         obj_key = os.path.basename(file_name_simple)
         s3_helper.set_bucket_versioning(s3_client, bucket, VersioningStatus.ENABLED)
         with allure.step("Put several versions of object into bucket"):
             version_id_1 = s3_client.put_object(bucket, file_name_simple)
             file_name_1 = generate_file_with_content(
-                simple_object_size, file_path=file_name_simple, content=version_2_content
+                simple_object_size.value, file_path=file_name_simple, content=version_2_content
             )
             version_id_2 = s3_client.put_object(bucket, file_name_1)
 
@@ -430,16 +449,16 @@ class TestS3GateObject:
         self,
         s3_client: S3ClientWrapper,
         bucket: str,
-        complex_object_size: int,
-        simple_object_size: int,
+        complex_object_size: ObjectSize,
+        simple_object_size: ObjectSize,
     ):
-        file_path = generate_file(complex_object_size)
+        file_path = generate_file(complex_object_size.value)
         file_name = s3_helper.object_key_from_file_path(file_path)
         file_hash = get_file_hash(file_path)
         s3_helper.set_bucket_versioning(s3_client, bucket, VersioningStatus.ENABLED)
         with allure.step("Put several versions of object into bucket"):
             version_id_1 = s3_client.put_object(bucket, file_path)
-            file_name_1 = generate_file_with_content(simple_object_size, file_path=file_path)
+            file_name_1 = generate_file_with_content(simple_object_size.value, file_path=file_path)
             version_id_2 = s3_client.put_object(bucket, file_name_1)
 
         with allure.step("Get first version of object"):
@@ -447,19 +466,25 @@ class TestS3GateObject:
                 bucket,
                 file_name,
                 version_id_1,
-                object_range=[0, int(complex_object_size / 3)],
+                object_range=[0, int(complex_object_size.value / 3)],
             )
             object_1_part_2 = s3_client.get_object(
                 bucket,
                 file_name,
                 version_id_1,
-                object_range=[int(complex_object_size / 3) + 1, 2 * int(complex_object_size / 3)],
+                object_range=[
+                    int(complex_object_size.value / 3) + 1,
+                    2 * int(complex_object_size.value / 3),
+                ],
             )
             object_1_part_3 = s3_client.get_object(
                 bucket,
                 file_name,
                 version_id_1,
-                object_range=[2 * int(complex_object_size / 3) + 1, complex_object_size],
+                object_range=[
+                    2 * int(complex_object_size.value / 3) + 1,
+                    complex_object_size.value,
+                ],
             )
             con_file = concat_files([object_1_part_1, object_1_part_2, object_1_part_3])
             assert get_file_hash(con_file) == file_hash, "Hashes must be the same"
@@ -469,19 +494,22 @@ class TestS3GateObject:
                 bucket,
                 file_name,
                 version_id_2,
-                object_range=[0, int(simple_object_size / 3)],
+                object_range=[0, int(simple_object_size.value / 3)],
             )
             object_2_part_2 = s3_client.get_object(
                 bucket,
                 file_name,
                 version_id_2,
-                object_range=[int(simple_object_size / 3) + 1, 2 * int(simple_object_size / 3)],
+                object_range=[
+                    int(simple_object_size.value / 3) + 1,
+                    2 * int(simple_object_size.value / 3),
+                ],
             )
             object_2_part_3 = s3_client.get_object(
                 bucket,
                 file_name,
                 version_id_2,
-                object_range=[2 * int(simple_object_size / 3) + 1, simple_object_size],
+                object_range=[2 * int(simple_object_size.value / 3) + 1, simple_object_size.value],
             )
             con_file_1 = concat_files([object_2_part_1, object_2_part_2, object_2_part_3])
             assert get_file_hash(con_file_1) == get_file_hash(
@@ -490,17 +518,20 @@ class TestS3GateObject:
 
         with allure.step("Get object"):
             object_3_part_1 = s3_client.get_object(
-                bucket, file_name, object_range=[0, int(simple_object_size / 3)]
+                bucket, file_name, object_range=[0, int(simple_object_size.value / 3)]
             )
             object_3_part_2 = s3_client.get_object(
                 bucket,
                 file_name,
-                object_range=[int(simple_object_size / 3) + 1, 2 * int(simple_object_size / 3)],
+                object_range=[
+                    int(simple_object_size.value / 3) + 1,
+                    2 * int(simple_object_size.value / 3),
+                ],
             )
             object_3_part_3 = s3_client.get_object(
                 bucket,
                 file_name,
-                object_range=[2 * int(simple_object_size / 3) + 1, simple_object_size],
+                object_range=[2 * int(simple_object_size.value / 3) + 1, simple_object_size.value],
             )
             con_file = concat_files([object_3_part_1, object_3_part_2, object_3_part_3])
             assert get_file_hash(con_file) == get_file_hash(file_name_1), "Hashes must be the same"
@@ -540,17 +571,17 @@ class TestS3GateObject:
         self,
         s3_client: S3ClientWrapper,
         bucket: str,
-        complex_object_size: int,
-        simple_object_size: int,
+        complex_object_size: ObjectSize,
+        simple_object_size: ObjectSize,
     ):
         object_metadata = {f"{uuid.uuid4()}": f"{uuid.uuid4()}"}
-        file_path = generate_file(complex_object_size)
+        file_path = generate_file(complex_object_size.value)
         file_name = s3_helper.object_key_from_file_path(file_path)
         s3_helper.set_bucket_versioning(s3_client, bucket, VersioningStatus.ENABLED)
 
         with allure.step("Put several versions of object into bucket"):
             version_id_1 = s3_client.put_object(bucket, file_path, metadata=object_metadata)
-            file_name_1 = generate_file_with_content(simple_object_size, file_path=file_path)
+            file_name_1 = generate_file_with_content(simple_object_size.value, file_path=file_path)
             version_id_2 = s3_client.put_object(bucket, file_name_1)
 
         with allure.step("Get head of first version of object"):
@@ -578,11 +609,15 @@ class TestS3GateObject:
     @allure.title("Test S3: list of object with versions")
     @pytest.mark.parametrize("list_type", ["v1", "v2"])
     def test_s3_list_object(
-        self, s3_client: S3ClientWrapper, list_type: str, bucket: str, complex_object_size: int
+        self,
+        s3_client: S3ClientWrapper,
+        list_type: str,
+        bucket: str,
+        complex_object_size: ObjectSize,
     ):
-        file_path_1 = generate_file(complex_object_size)
+        file_path_1 = generate_file(complex_object_size.value)
         file_name = s3_helper.object_key_from_file_path(file_path_1)
-        file_path_2 = generate_file(complex_object_size)
+        file_path_2 = generate_file(complex_object_size.value)
         file_name_2 = s3_helper.object_key_from_file_path(file_path_2)
 
         s3_helper.set_bucket_versioning(s3_client, bucket, VersioningStatus.ENABLED)
@@ -618,10 +653,10 @@ class TestS3GateObject:
         self,
         s3_client: S3ClientWrapper,
         bucket: str,
-        complex_object_size: int,
-        simple_object_size: int,
+        complex_object_size: ObjectSize,
+        simple_object_size: ObjectSize,
     ):
-        file_path_1 = generate_file(complex_object_size)
+        file_path_1 = generate_file(complex_object_size.value)
         file_name = s3_helper.object_key_from_file_path(file_path_1)
         object_1_metadata = {f"{uuid.uuid4()}": f"{uuid.uuid4()}"}
         tag_key_1 = "tag1"
@@ -644,7 +679,9 @@ class TestS3GateObject:
             ], "Tags must be the same"
 
         with allure.step("Rewrite file into bucket"):
-            file_path_2 = generate_file_with_content(simple_object_size, file_path=file_path_1)
+            file_path_2 = generate_file_with_content(
+                simple_object_size.value, file_path=file_path_1
+            )
             s3_client.put_object(bucket, file_path_2, metadata=object_2_metadata, tagging=tag_2)
             obj_head = s3_client.head_object(bucket, file_name)
             assert obj_head.get("Metadata") == object_2_metadata, "Metadata must be the same"
@@ -656,7 +693,7 @@ class TestS3GateObject:
 
         s3_helper.set_bucket_versioning(s3_client, bucket, VersioningStatus.ENABLED)
 
-        file_path_3 = generate_file(complex_object_size)
+        file_path_3 = generate_file(complex_object_size.value)
         file_hash = get_file_hash(file_path_3)
         file_name_3 = s3_helper.object_key_from_file_path(file_path_3)
         object_3_metadata = {f"{uuid.uuid4()}": f"{uuid.uuid4()}"}
@@ -677,7 +714,9 @@ class TestS3GateObject:
             ], "Tags must be the same"
 
         with allure.step("Put new version of file into bucket"):
-            file_path_4 = generate_file_with_content(simple_object_size, file_path=file_path_3)
+            file_path_4 = generate_file_with_content(
+                simple_object_size.value, file_path=file_path_3
+            )
             version_id_2 = s3_client.put_object(bucket, file_path_4)
             versions = s3_client.list_objects_versions(bucket)
             obj_versions = {
@@ -722,11 +761,11 @@ class TestS3GateObject:
         s3_client: S3ClientWrapper,
         bucket_versioning: Literal["ENABLED", "SUSPENDED"],
         bucket: str,
-        complex_object_size: int,
-        simple_object_size: int,
+        complex_object_size: ObjectSize,
+        simple_object_size: ObjectSize,
         second_wallet_public_key: str,
     ):
-        file_path_1 = generate_file(complex_object_size)
+        file_path_1 = generate_file(complex_object_size.value)
         file_name = s3_helper.object_key_from_file_path(file_path_1)
         if bucket_versioning == "ENABLED":
             status = VersioningStatus.ENABLED
@@ -742,7 +781,9 @@ class TestS3GateObject:
             assert get_file_hash(file_path_1) == get_file_hash(object_1), "Hashes must be the same"
 
         with allure.step("Put object with acl public-read"):
-            file_path_2 = generate_file_with_content(simple_object_size, file_path=file_path_1)
+            file_path_2 = generate_file_with_content(
+                simple_object_size.value, file_path=file_path_1
+            )
             s3_client.put_object(bucket, file_path_2, acl="public-read")
             obj_acl = s3_client.get_object_acl(bucket, file_name)
             s3_helper.assert_s3_acl(acl_grants=obj_acl, permitted_users="AllUsers")
@@ -750,7 +791,9 @@ class TestS3GateObject:
             assert get_file_hash(file_path_2) == get_file_hash(object_2), "Hashes must be the same"
 
         with allure.step("Put object with acl public-read-write"):
-            file_path_3 = generate_file_with_content(simple_object_size, file_path=file_path_1)
+            file_path_3 = generate_file_with_content(
+                simple_object_size.value, file_path=file_path_1
+            )
             s3_client.put_object(bucket, file_path_3, acl="public-read-write")
             obj_acl = s3_client.get_object_acl(bucket, file_name)
             s3_helper.assert_s3_acl(acl_grants=obj_acl, permitted_users="AllUsers")
@@ -758,18 +801,20 @@ class TestS3GateObject:
             assert get_file_hash(file_path_3) == get_file_hash(object_3), "Hashes must be the same"
 
         with allure.step("Put object with acl authenticated-read"):
-            file_path_4 = generate_file_with_content(simple_object_size, file_path=file_path_1)
+            file_path_4 = generate_file_with_content(
+                simple_object_size.value, file_path=file_path_1
+            )
             s3_client.put_object(bucket, file_path_4, acl="authenticated-read")
             obj_acl = s3_client.get_object_acl(bucket, file_name)
             s3_helper.assert_s3_acl(acl_grants=obj_acl, permitted_users="AllUsers")
             object_4 = s3_client.get_object(bucket, file_name)
             assert get_file_hash(file_path_4) == get_file_hash(object_4), "Hashes must be the same"
 
-        file_path_5 = generate_file(complex_object_size)
+        file_path_5 = generate_file(complex_object_size.value)
         file_name_5 = s3_helper.object_key_from_file_path(file_path_5)
 
         with allure.step("Put object with --grant-full-control id=mycanonicaluserid"):
-            generate_file_with_content(simple_object_size, file_path=file_path_5)
+            generate_file_with_content(simple_object_size.value, file_path=file_path_5)
             s3_client.put_object(
                 bucket,
                 file_path_5,
@@ -783,7 +828,7 @@ class TestS3GateObject:
         with allure.step(
             "Put object with --grant-read uri=http://acs.amazonaws.com/groups/global/AllUsers"
         ):
-            generate_file_with_content(simple_object_size, file_path=file_path_5)
+            generate_file_with_content(simple_object_size.value, file_path=file_path_5)
             s3_client.put_object(
                 bucket,
                 file_path_5,
@@ -796,10 +841,13 @@ class TestS3GateObject:
 
     @allure.title("Test S3: put object with lock-mode")
     def test_s3_put_object_lock_mode(
-        self, s3_client: S3ClientWrapper, complex_object_size: int, simple_object_size: int
+        self,
+        s3_client: S3ClientWrapper,
+        complex_object_size: ObjectSize,
+        simple_object_size: ObjectSize,
     ):
 
-        file_path_1 = generate_file(complex_object_size)
+        file_path_1 = generate_file(complex_object_size.value)
         file_name = s3_helper.object_key_from_file_path(file_path_1)
         bucket = s3_client.create_bucket(object_lock_enabled_for_bucket=True)
         s3_helper.set_bucket_versioning(s3_client, bucket, VersioningStatus.ENABLED)
@@ -823,7 +871,7 @@ class TestS3GateObject:
             "Put new version of object with [--object-lock-mode COMPLIANCE] и [--object-lock-retain-until-date +3days]"
         ):
             date_obj = datetime.utcnow() + timedelta(days=2)
-            generate_file_with_content(simple_object_size, file_path=file_path_1)
+            generate_file_with_content(simple_object_size.value, file_path=file_path_1)
             s3_client.put_object(
                 bucket,
                 file_path_1,
@@ -838,7 +886,7 @@ class TestS3GateObject:
             "Put new version of object with [--object-lock-mode COMPLIANCE] и [--object-lock-retain-until-date +2days]"
         ):
             date_obj = datetime.utcnow() + timedelta(days=3)
-            generate_file_with_content(simple_object_size, file_path=file_path_1)
+            generate_file_with_content(simple_object_size.value, file_path=file_path_1)
             s3_client.put_object(
                 bucket,
                 file_path_1,
@@ -879,7 +927,7 @@ class TestS3GateObject:
         s3_client: S3ClientWrapper,
         sync_type: Literal["sync", "cp"],
         bucket: str,
-        simple_object_size: int,
+        simple_object_size: ObjectSize,
     ):
         file_path_1 = os.path.join(os.getcwd(), ASSETS_DIR, "test_sync", "test_file_1")
         file_path_2 = os.path.join(os.getcwd(), ASSETS_DIR, "test_sync", "test_file_2")
@@ -889,8 +937,8 @@ class TestS3GateObject:
         if not isinstance(s3_client, AwsCliClient):
             pytest.skip("This test is not supported with boto3 client")
 
-        generate_file_with_content(simple_object_size, file_path=file_path_1)
-        generate_file_with_content(simple_object_size, file_path=file_path_2)
+        generate_file_with_content(simple_object_size.value, file_path=file_path_1)
+        generate_file_with_content(simple_object_size.value, file_path=file_path_2)
         s3_helper.set_bucket_versioning(s3_client, bucket, VersioningStatus.ENABLED)
         # TODO: return ACL, when https://github.com/nspcc-dev/neofs-s3-gw/issues/685 will be closed
         if sync_type == "sync":
@@ -930,11 +978,15 @@ class TestS3GateObject:
 
     @allure.title("Test S3 Put 10 nested level object")
     def test_s3_put_10_folder(
-        self, s3_client: S3ClientWrapper, bucket: str, temp_directory, simple_object_size: int
+        self,
+        s3_client: S3ClientWrapper,
+        bucket: str,
+        temp_directory,
+        simple_object_size: ObjectSize,
     ):
         path = "/".join(["".join(choices(string.ascii_letters, k=3)) for _ in range(10)])
         file_path_1 = os.path.join(temp_directory, path, "test_file_1")
-        generate_file_with_content(simple_object_size, file_path=file_path_1)
+        generate_file_with_content(simple_object_size.value, file_path=file_path_1)
         file_name = s3_helper.object_key_from_file_path(file_path_1)
         objects_list = s3_client.list_objects(bucket)
         assert not objects_list, f"Expected empty bucket, got {objects_list}"
@@ -962,14 +1014,14 @@ class TestS3GateObject:
 
     @allure.title("Test S3: Delete the same object twice")
     def test_s3_delete_twice(
-        self, s3_client: S3ClientWrapper, bucket: str, simple_object_size: int
+        self, s3_client: S3ClientWrapper, bucket: str, simple_object_size: ObjectSize
     ):
         s3_helper.set_bucket_versioning(s3_client, bucket, VersioningStatus.ENABLED)
         objects_list = s3_client.list_objects(bucket)
         with allure.step("Check that bucket is empty"):
             assert not objects_list, f"Expected empty bucket, got {objects_list}"
 
-        file_path = generate_file(simple_object_size)
+        file_path = generate_file(simple_object_size.value)
         file_name = s3_helper.object_key_from_file_path(file_path)
 
         with allure.step("Put object into one bucket"):
diff --git a/pytest_tests/testsuites/services/s3_gate/test_s3_policy.py b/pytest_tests/testsuites/services/s3_gate/test_s3_policy.py
index 366d702..d1dc766 100644
--- a/pytest_tests/testsuites/services/s3_gate/test_s3_policy.py
+++ b/pytest_tests/testsuites/services/s3_gate/test_s3_policy.py
@@ -6,6 +6,7 @@ from frostfs_testlib.s3 import AwsCliClient, Boto3ClientWrapper, S3ClientWrapper
 from frostfs_testlib.steps.cli.container import search_container_by_name
 from frostfs_testlib.steps.s3 import s3_helper
 from frostfs_testlib.steps.storage_policy import get_simple_object_copies
+from frostfs_testlib.storage.dataclasses.object_size import ObjectSize
 from frostfs_testlib.testing.cluster_test_base import ClusterTestBase
 from frostfs_testlib.testing.test_control import expect_not_raises
 from frostfs_testlib.utils.file_utils import generate_file
@@ -26,11 +27,11 @@ def pytest_generate_tests(metafunc: pytest.Metafunc):
 class TestS3GatePolicy(ClusterTestBase):
     @allure.title("Test S3: Verify bucket creation with retention policy applied")
     def test_s3_bucket_location(
-        self, default_wallet: str, s3_client: S3ClientWrapper, simple_object_size: int
+        self, default_wallet: str, s3_client: S3ClientWrapper, simple_object_size: ObjectSize
     ):
-        file_path_1 = generate_file(simple_object_size)
+        file_path_1 = generate_file(simple_object_size.value)
         file_name_1 = s3_helper.object_key_from_file_path(file_path_1)
-        file_path_2 = generate_file(simple_object_size)
+        file_path_2 = generate_file(simple_object_size.value)
         file_name_2 = s3_helper.object_key_from_file_path(file_path_2)
 
         with allure.step("Create two buckets with different bucket configuration"):
diff --git a/pytest_tests/testsuites/services/s3_gate/test_s3_tagging.py b/pytest_tests/testsuites/services/s3_gate/test_s3_tagging.py
index 57b1a5f..448a3e6 100644
--- a/pytest_tests/testsuites/services/s3_gate/test_s3_tagging.py
+++ b/pytest_tests/testsuites/services/s3_gate/test_s3_tagging.py
@@ -6,6 +6,7 @@ import allure
 import pytest
 from frostfs_testlib.s3 import AwsCliClient, Boto3ClientWrapper, S3ClientWrapper
 from frostfs_testlib.steps.s3 import s3_helper
+from frostfs_testlib.storage.dataclasses.object_size import ObjectSize
 from frostfs_testlib.utils.file_utils import generate_file
 
 
@@ -29,9 +30,9 @@ class TestS3GateTagging:
 
     @allure.title("Test S3: Object tagging")
     def test_s3_object_tagging(
-        self, s3_client: S3ClientWrapper, bucket: str, simple_object_size: int
+        self, s3_client: S3ClientWrapper, bucket: str, simple_object_size: ObjectSize
     ):
-        file_path = generate_file(simple_object_size)
+        file_path = generate_file(simple_object_size.value)
         file_name = s3_helper.object_key_from_file_path(file_path)
 
         with allure.step("Put with 3 tags object into bucket"):
diff --git a/pytest_tests/testsuites/services/s3_gate/test_s3_versioning.py b/pytest_tests/testsuites/services/s3_gate/test_s3_versioning.py
index fe4f361..108ae63 100644
--- a/pytest_tests/testsuites/services/s3_gate/test_s3_versioning.py
+++ b/pytest_tests/testsuites/services/s3_gate/test_s3_versioning.py
@@ -4,6 +4,7 @@ import allure
 import pytest
 from frostfs_testlib.s3 import AwsCliClient, Boto3ClientWrapper, S3ClientWrapper, VersioningStatus
 from frostfs_testlib.steps.s3 import s3_helper
+from frostfs_testlib.storage.dataclasses.object_size import ObjectSize
 from frostfs_testlib.utils.file_utils import generate_file, generate_file_with_content
 
 
@@ -23,8 +24,8 @@ class TestS3GateVersioning:
             s3_helper.set_bucket_versioning(s3_client, bucket, VersioningStatus.SUSPENDED)
 
     @allure.title("Test S3: Enable and disable versioning")
-    def test_s3_version(self, s3_client: S3ClientWrapper, simple_object_size: int):
-        file_path = generate_file(simple_object_size)
+    def test_s3_version(self, s3_client: S3ClientWrapper, simple_object_size: ObjectSize):
+        file_path = generate_file(simple_object_size.value)
         file_name = s3_helper.object_key_from_file_path(file_path)
         bucket_objects = [file_name]
         bucket = s3_client.create_bucket(object_lock_enabled_for_bucket=False)
@@ -54,7 +55,7 @@ class TestS3GateVersioning:
 
         with allure.step("Put several versions of object into bucket"):
             version_id_1 = s3_client.put_object(bucket, file_path)
-            file_name_1 = generate_file_with_content(simple_object_size, file_path=file_path)
+            file_name_1 = generate_file_with_content(simple_object_size.value, file_path=file_path)
             version_id_2 = s3_client.put_object(bucket, file_name_1)
 
         with allure.step("Check bucket shows all versions"):
diff --git a/pytest_tests/testsuites/session_token/test_object_session_token.py b/pytest_tests/testsuites/session_token/test_object_session_token.py
index e57d116..a815934 100644
--- a/pytest_tests/testsuites/session_token/test_object_session_token.py
+++ b/pytest_tests/testsuites/session_token/test_object_session_token.py
@@ -7,6 +7,7 @@ from frostfs_testlib.resources.error_patterns import SESSION_NOT_FOUND
 from frostfs_testlib.steps.cli.container import create_container
 from frostfs_testlib.steps.cli.object import delete_object, put_object, put_object_to_random_node
 from frostfs_testlib.steps.session_token import create_session_token
+from frostfs_testlib.storage.dataclasses.object_size import ObjectSize
 from frostfs_testlib.testing.cluster_test_base import ClusterTestBase
 from frostfs_testlib.utils import wallet_utils
 from frostfs_testlib.utils.file_utils import generate_file
@@ -19,9 +20,9 @@ class TestDynamicObjectSession(ClusterTestBase):
     @pytest.mark.parametrize(
         "object_size",
         [pytest.lazy_fixture("simple_object_size"), pytest.lazy_fixture("complex_object_size")],
-        ids=["simple object", "complex object"],
+        ids=["simple object size", "complex object size"],
     )
-    def test_object_session_token(self, default_wallet, object_size):
+    def test_object_session_token(self, default_wallet: str, object_size: ObjectSize):
         """
         Test how operations over objects are executed with a session token
 
@@ -69,7 +70,7 @@ class TestDynamicObjectSession(ClusterTestBase):
             )
 
         with allure.step("Put Objects"):
-            file_path = generate_file(object_size)
+            file_path = generate_file(object_size.value)
             oid = put_object_to_random_node(
                 wallet=wallet,
                 path=file_path,
diff --git a/pytest_tests/testsuites/session_token/test_static_object_session_token.py b/pytest_tests/testsuites/session_token/test_static_object_session_token.py
index 8db6cfc..2ae5f81 100644
--- a/pytest_tests/testsuites/session_token/test_static_object_session_token.py
+++ b/pytest_tests/testsuites/session_token/test_static_object_session_token.py
@@ -35,6 +35,7 @@ from frostfs_testlib.steps.session_token import (
 )
 from frostfs_testlib.steps.storage_object import delete_objects
 from frostfs_testlib.storage.cluster import Cluster
+from frostfs_testlib.storage.dataclasses.object_size import ObjectSize
 from frostfs_testlib.storage.dataclasses.storage_object_info import StorageObjectInfo
 from frostfs_testlib.storage.dataclasses.wallet import WalletInfo
 from frostfs_testlib.testing.cluster_test_base import ClusterTestBase
@@ -62,7 +63,7 @@ def storage_containers(
 
 @pytest.fixture(
     params=[pytest.lazy_fixture("simple_object_size"), pytest.lazy_fixture("complex_object_size")],
-    ids=["simple object", "complex object"],
+    ids=["simple object size", "complex object size"],
     # Scope module to upload/delete each files set only once
     scope="module",
 )
@@ -74,7 +75,8 @@ def storage_objects(
     request: FixtureRequest,
 ) -> list[StorageObjectInfo]:
 
-    file_path = generate_file(request.param)
+    object_size: ObjectSize = request.param
+    file_path = generate_file(object_size.value)
     storage_objects = []
 
     with allure.step("Put objects"):
@@ -89,7 +91,7 @@ def storage_objects(
             )
 
             storage_object = StorageObjectInfo(storage_containers[0], storage_object_id)
-            storage_object.size = request.param
+            storage_object.size = object_size.value
             storage_object.wallet_file_path = owner_wallet.path
             storage_object.file_path = file_path
             storage_objects.append(storage_object)
diff --git a/pytest_tests/testsuites/session_token/test_static_session_token_container.py b/pytest_tests/testsuites/session_token/test_static_session_token_container.py
index 8faae18..1964044 100644
--- a/pytest_tests/testsuites/session_token/test_static_session_token_container.py
+++ b/pytest_tests/testsuites/session_token/test_static_session_token_container.py
@@ -11,6 +11,7 @@ from frostfs_testlib.steps.cli.container import (
 )
 from frostfs_testlib.steps.session_token import ContainerVerb, get_container_signed_token
 from frostfs_testlib.storage.dataclasses.acl import EACLAccess, EACLOperation, EACLRole, EACLRule
+from frostfs_testlib.storage.dataclasses.object_size import ObjectSize
 from frostfs_testlib.storage.dataclasses.wallet import WalletInfo
 from frostfs_testlib.testing.cluster_test_base import ClusterTestBase
 from frostfs_testlib.utils.file_utils import generate_file
@@ -141,7 +142,7 @@ class TestSessionTokenContainer(ClusterTestBase):
         user_wallet: WalletInfo,
         stranger_wallet: WalletInfo,
         static_sessions: dict[ContainerVerb, str],
-        simple_object_size,
+        simple_object_size: ObjectSize,
     ):
         """
         Validate static session with set eacl operation
@@ -153,7 +154,7 @@ class TestSessionTokenContainer(ClusterTestBase):
                 shell=self.shell,
                 endpoint=self.cluster.default_rpc_endpoint,
             )
-        file_path = generate_file(simple_object_size)
+        file_path = generate_file(simple_object_size.value)
         assert can_put_object(stranger_wallet.path, cid, file_path, self.shell, self.cluster)
 
         with allure.step("Deny all operations for other via eACL"):