diff --git a/storagegroup/convert.go b/storagegroup/convert.go
deleted file mode 100644
index 898d4932..00000000
--- a/storagegroup/convert.go
+++ /dev/null
@@ -1,59 +0,0 @@
-package storagegroup
-
-import (
-	"git.frostfs.info/TrueCloudLab/frostfs-api-go/v2/refs"
-	refsGRPC "git.frostfs.info/TrueCloudLab/frostfs-api-go/v2/refs/grpc"
-	"git.frostfs.info/TrueCloudLab/frostfs-api-go/v2/rpc/grpc"
-	"git.frostfs.info/TrueCloudLab/frostfs-api-go/v2/rpc/message"
-	sg "git.frostfs.info/TrueCloudLab/frostfs-api-go/v2/storagegroup/grpc"
-)
-
-func (s *StorageGroup) ToGRPCMessage() grpc.Message {
-	m := new(sg.StorageGroup)
-
-	if s != nil {
-		m = new(sg.StorageGroup)
-
-		m.SetMembers(refs.ObjectIDListToGRPCMessage(s.members))
-		//nolint:staticcheck
-		m.SetExpirationEpoch(s.exp)
-		m.SetValidationDataSize(s.size)
-		m.SetValidationHash(s.hash.ToGRPCMessage().(*refsGRPC.Checksum))
-	}
-
-	return m
-}
-
-func (s *StorageGroup) FromGRPCMessage(m grpc.Message) error {
-	v, ok := m.(*sg.StorageGroup)
-	if !ok {
-		return message.NewUnexpectedMessageType(m, v)
-	}
-
-	var err error
-
-	hash := v.GetValidationHash()
-	if hash == nil {
-		s.hash = nil
-	} else {
-		if s.hash == nil {
-			s.hash = new(refs.Checksum)
-		}
-
-		err = s.hash.FromGRPCMessage(hash)
-		if err != nil {
-			return err
-		}
-	}
-
-	s.members, err = refs.ObjectIDListFromGRPCMessage(v.GetMembers())
-	if err != nil {
-		return err
-	}
-
-	//nolint:staticcheck
-	s.exp = v.GetExpirationEpoch()
-	s.size = v.GetValidationDataSize()
-
-	return nil
-}
diff --git a/storagegroup/grpc/types.go b/storagegroup/grpc/types.go
deleted file mode 100644
index 9be5c240..00000000
--- a/storagegroup/grpc/types.go
+++ /dev/null
@@ -1,27 +0,0 @@
-package storagegroup
-
-import (
-	refs "git.frostfs.info/TrueCloudLab/frostfs-api-go/v2/refs/grpc"
-)
-
-// SetValidationDataSize sets the total size of the payloads of the storage group.
-func (m *StorageGroup) SetValidationDataSize(v uint64) {
-	m.ValidationDataSize = v
-}
-
-// SetValidationHash sets total homomorphic hash of the storage group payloads.
-func (m *StorageGroup) SetValidationHash(v *refs.Checksum) {
-	m.ValidationHash = v
-}
-
-// SetExpirationEpoch sets number of the last epoch of the storage group lifetime.
-//
-// Deprecated: do not use, `expiration_epoch` field is deprecated in protocol.
-func (m *StorageGroup) SetExpirationEpoch(v uint64) {
-	m.ExpirationEpoch = v
-}
-
-// SetMembers sets list of the identifiers of the storage group members.
-func (m *StorageGroup) SetMembers(v []*refs.ObjectID) {
-	m.Members = v
-}
diff --git a/storagegroup/grpc/types.pb.go b/storagegroup/grpc/types.pb.go
deleted file mode 100644
index 75f5b46e..00000000
Binary files a/storagegroup/grpc/types.pb.go and /dev/null differ
diff --git a/storagegroup/json.go b/storagegroup/json.go
deleted file mode 100644
index b1228932..00000000
--- a/storagegroup/json.go
+++ /dev/null
@@ -1,14 +0,0 @@
-package storagegroup
-
-import (
-	"git.frostfs.info/TrueCloudLab/frostfs-api-go/v2/rpc/message"
-	storagegroup "git.frostfs.info/TrueCloudLab/frostfs-api-go/v2/storagegroup/grpc"
-)
-
-func (s *StorageGroup) MarshalJSON() ([]byte, error) {
-	return message.MarshalJSON(s)
-}
-
-func (s *StorageGroup) UnmarshalJSON(data []byte) error {
-	return message.UnmarshalJSON(s, data, new(storagegroup.StorageGroup))
-}
diff --git a/storagegroup/marshal.go b/storagegroup/marshal.go
deleted file mode 100644
index 3f8171a9..00000000
--- a/storagegroup/marshal.go
+++ /dev/null
@@ -1,54 +0,0 @@
-package storagegroup
-
-import (
-	"git.frostfs.info/TrueCloudLab/frostfs-api-go/v2/refs"
-	"git.frostfs.info/TrueCloudLab/frostfs-api-go/v2/rpc/message"
-	storagegroup "git.frostfs.info/TrueCloudLab/frostfs-api-go/v2/storagegroup/grpc"
-	"git.frostfs.info/TrueCloudLab/frostfs-api-go/v2/util/proto"
-)
-
-const (
-	sizeField       = 1
-	hashField       = 2
-	expirationField = 3
-	objectIDsField  = 4
-)
-
-// StableMarshal marshals unified storage group structure in a protobuf
-// compatible way without field order shuffle.
-func (s *StorageGroup) StableMarshal(buf []byte) []byte {
-	if s == nil {
-		return []byte{}
-	}
-
-	if buf == nil {
-		buf = make([]byte, s.StableSize())
-	}
-
-	var offset int
-
-	offset += proto.UInt64Marshal(sizeField, buf[offset:], s.size)
-	offset += proto.NestedStructureMarshal(hashField, buf[offset:], s.hash)
-	offset += proto.UInt64Marshal(expirationField, buf[offset:], s.exp)
-	refs.ObjectIDNestedListMarshal(objectIDsField, buf[offset:], s.members)
-
-	return buf
-}
-
-// StableSize of storage group structure marshalled by StableMarshal function.
-func (s *StorageGroup) StableSize() (size int) {
-	if s == nil {
-		return 0
-	}
-
-	size += proto.UInt64Size(sizeField, s.size)
-	size += proto.NestedStructureSize(hashField, s.hash)
-	size += proto.UInt64Size(expirationField, s.exp)
-	size += refs.ObjectIDNestedListSize(objectIDsField, s.members)
-
-	return size
-}
-
-func (s *StorageGroup) Unmarshal(data []byte) error {
-	return message.Unmarshal(s, data, new(storagegroup.StorageGroup))
-}
diff --git a/storagegroup/message_test.go b/storagegroup/message_test.go
deleted file mode 100644
index e4ed3677..00000000
--- a/storagegroup/message_test.go
+++ /dev/null
@@ -1,15 +0,0 @@
-package storagegroup_test
-
-import (
-	"testing"
-
-	"git.frostfs.info/TrueCloudLab/frostfs-api-go/v2/rpc/message"
-	messagetest "git.frostfs.info/TrueCloudLab/frostfs-api-go/v2/rpc/message/test"
-	storagegrouptest "git.frostfs.info/TrueCloudLab/frostfs-api-go/v2/storagegroup/test"
-)
-
-func TestMessageConvert(t *testing.T) {
-	messagetest.TestRPCMessage(t,
-		func(empty bool) message.Message { return storagegrouptest.GenerateStorageGroup(empty) },
-	)
-}
diff --git a/storagegroup/test/generate.go b/storagegroup/test/generate.go
deleted file mode 100644
index b53f199e..00000000
--- a/storagegroup/test/generate.go
+++ /dev/null
@@ -1,21 +0,0 @@
-package storagegrouptest
-
-import (
-	refstest "git.frostfs.info/TrueCloudLab/frostfs-api-go/v2/refs/test"
-	"git.frostfs.info/TrueCloudLab/frostfs-api-go/v2/storagegroup"
-)
-
-func GenerateStorageGroup(empty bool) *storagegroup.StorageGroup {
-	m := new(storagegroup.StorageGroup)
-
-	if !empty {
-		m.SetValidationDataSize(44)
-		//nolint:staticcheck
-		m.SetExpirationEpoch(55)
-		m.SetMembers(refstest.GenerateObjectIDs(false))
-	}
-
-	m.SetValidationHash(refstest.GenerateChecksum(empty))
-
-	return m
-}
diff --git a/storagegroup/types.go b/storagegroup/types.go
deleted file mode 100644
index b5a3a5b4..00000000
--- a/storagegroup/types.go
+++ /dev/null
@@ -1,79 +0,0 @@
-package storagegroup
-
-import (
-	"git.frostfs.info/TrueCloudLab/frostfs-api-go/v2/refs"
-)
-
-// StorageGroup is a unified structure of StorageGroup
-// message from proto definition.
-type StorageGroup struct {
-	size uint64
-
-	hash *refs.Checksum
-
-	exp uint64
-
-	members []refs.ObjectID
-}
-
-// GetValidationDataSize of unified storage group structure.
-func (s *StorageGroup) GetValidationDataSize() uint64 {
-	if s != nil {
-		return s.size
-	}
-
-	return 0
-}
-
-// SetValidationDataSize into unified storage group structure.
-func (s *StorageGroup) SetValidationDataSize(v uint64) {
-	s.size = v
-}
-
-// GetValidationHash of unified storage group structure.
-func (s *StorageGroup) GetValidationHash() *refs.Checksum {
-	if s != nil {
-		return s.hash
-	}
-
-	return nil
-}
-
-// SetValidationHash into unified storage group structure.
-func (s *StorageGroup) SetValidationHash(v *refs.Checksum) {
-	s.hash = v
-}
-
-// GetExpirationEpoch of unified storage group structure.
-//
-// Deprecated: Do not use.
-func (s *StorageGroup) GetExpirationEpoch() uint64 {
-	if s != nil {
-		return s.exp
-	}
-
-	return 0
-}
-
-// SetExpirationEpoch into unified storage group structure.
-//
-// Deprecated: Do not use.
-func (s *StorageGroup) SetExpirationEpoch(v uint64) {
-	s.exp = v
-}
-
-// GetMembers of unified storage group structure. Members are objects of
-// storage group.
-func (s *StorageGroup) GetMembers() []refs.ObjectID {
-	if s != nil {
-		return s.members
-	}
-
-	return nil
-}
-
-// SetMembers into unified storage group structure. Members are objects of
-// storage group.
-func (s *StorageGroup) SetMembers(v []refs.ObjectID) {
-	s.members = v
-}