The U.S. military has spent untold resources studying the stresses put on the human body during various backpacking scenarios. In other words, they know what they're doing when they develop backpack specs. This Field Pack is more than just a Backpack, it's the same full multi-piece rig used by the U.S. Army to support and evenly distribute a staggering amount of necessary equipment. Includes one massive Rucksack (aka Backpack) plus sustainment pouches, molded waist belt and enhanced shoulder strap assembly. Weight from the entire system is supported by a rigid MOLLE frame.