Description of Chrome Backbone Messenger Backpack The Backbone is the ideal pack for heavy-duty messenger work. Includes secret stash pocket and dual strap utility attachment points. Designed for for those who prefer the double strap support of backpacks, but still want the durability and weatherproof attributes of messenger bags. Chrome messenger packs are ridden by couriers worldwide for several simple reasons: The next step in messenger bag evolution. Features: Built to last a lifetime Guaranteed - Chrome's messenger bags are constructed with the most rugged assembly of industrial materials and hardware available: military spec. seam binding, 1000d Cordura shell, 18oz. weatherproof truck tarp liner, and nylon 69 thread. Weatherproof - It's like a bag within a bag. The independently suspended weatherproof liner freely floats within the outershell, eliminating seams exposed to the outside elements. Your cargo is safe from rain, snow, mud, and most anything else this cruel world can sling at you. Comfortable - Chrome's courier bags are designed with an anatomically correct EVA foam padded shoulder strap and cross chest load stabilizer. Functional - The quick release seat-buckle closure allows for on-the-fly one-handed tightening and loosening of the shoulder strap. 21x 20 x 7 Volume - 2400 cu. in.