Marc Jacobs Small Belted Sack Calfskin Leather Shoulder Bag — Black. Composition: 100% Calf Leather Bos Taurus. Exterior material: Calfskin Leather. Size: Small. Measurements: 34 × 32 × 13 cm (13.4″ × 12.6″ × 5.1″). Strap: Shoulder Strap. Closure: Zip. Carry: Shoulder.