diff --git a/v2/container/attributes.go b/v2/container/attributes.go
new file mode 100644
index 0000000..2dc0c92
--- /dev/null
+++ b/v2/container/attributes.go
@@ -0,0 +1,9 @@
+package container
+
+// SysAttrPrefix is a prefix of key to system attribute.
+const SysAttrPrefix = "__NEOFS__"
+
+const (
+	// SysAttrSubnet is a string ID of container's storage subnet.
+	SysAttrSubnet = SysAttrPrefix + "SUBNET"
+)