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