diff --git a/v2/object/attributes.go b/v2/object/attributes.go
new file mode 100644
index 0000000..0da07b8
--- /dev/null
+++ b/v2/object/attributes.go
@@ -0,0 +1,12 @@
+package object
+
+// SysAttrPrefix is a prefix of key to system attribute.
+const SysAttrPrefix = "__NEOFS__"
+
+const (
+	// SysAttrUploadID marks smaller parts of a split bigger object.
+	SysAttrUploadID = SysAttrPrefix + "UPLOAD_ID"
+
+	// SysAttrExpEpoch tells GC to delete object after that epoch.
+	SysAttrExpEpoch = SysAttrPrefix + "EXPIRATION_EPOCH"
+)