diff --git a/containers/containers.go b/containers/containers.go
index 275f8069e..c343a64a9 100644
--- a/containers/containers.go
+++ b/containers/containers.go
@@ -76,6 +76,9 @@ type Container struct {
 
 	// Extensions stores client-specified metadata
 	Extensions map[string]typeurl.Any
+
+	// SandboxID is an identifier of sandbox this container belongs to.
+	SandboxID string
 }
 
 // RuntimeInfo holds runtime specific information
diff --git a/metadata/containers.go b/metadata/containers.go
index b27dc0f87..d6517ce47 100644
--- a/metadata/containers.go
+++ b/metadata/containers.go
@@ -359,6 +359,8 @@ func readContainer(container *containers.Container, bkt *bolt.Bucket) error {
 			}
 
 			container.Extensions = extensions
+		case string(bucketKeySandboxID):
+			container.SandboxID = string(v)
 		}
 
 		return nil
@@ -407,5 +409,9 @@ func writeContainer(bkt *bolt.Bucket, container *containers.Container) error {
 		return err
 	}
 
+	if err := bkt.Put(bucketKeySandboxID, []byte(container.SandboxID)); err != nil {
+		return err
+	}
+
 	return boltutil.WriteLabels(bkt, container.Labels)
 }