Saint Laurent Vintage Pre-owned Envelope Chain Bag in Black. Condition: Rating B+. Envelope flap design with a chain strap offers shoulder or crossbody wear for everyday or evening use. Key attributes: Black | Chain strap for shoulder or crossbody wear | Envelope flap closure | Envelope flap | Rectangular silhouette | Chain strap detail | Dimensions & fit: Can be carried over the shoulder or worn across the body.