21" 1700 cu. in. Tactical Sling Shoulder Hiking Backpack BB002 DIGITAL CAMOUFLAGE (DMBK) Perfect for outdoor use! Digital Camouflage. Tactical Messenger Body Sling backpack - DMBK (Navy Blue) Capacity: 1700 cu. in. Size: 21(Height) x 13(Width) x 6(Depth) Triangular shaped, Detachable Padded shoulder strap with Velcro and Audio pass-through hole in front pocket