Heavy-duty No. 8 natural canvas. Rivet-reinforced for durability. Steel-frame mouth with hinge for rugged use. Stitched and riveted leather handles for comfort and strength. Two retaining straps with buckles provide secure closure. Moisture-resistant- vinyl bottom- and lower sides. Non-scratch studs on base protect against wear. Retro-fit bags with shoulder strap kit (Cat. No. 5102S). Kit includes leather strap with pad and snap hooks- rings and fasteners for attaching rings to bags.