A comfortable backpack system for carrying the park tool bx 2 blue box tool case padded shoulder waist and chest straps handy accessory pouches fully adjustable specially designed to carry the blue box on your back the park tool bxb 2 backpack harness is a well built secure and comfortable backpack system complete with padded shoulder straps handy accessory pouches plus waist and chest straps the bxb 2 is fully adjustable and set up is quick and easy note the bxb 2 will fit both