The U.S. military has spent untold resources studying the stresses put on the human body during the most backpacking scenarios. 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) followed by sustainment pouches, molded waist belt and enhanced shoulder strap assembly. Weight from the entire system is supported by a rigid MOLLE frame. Nylon CORDURAA(R) is abrasion and water-resistant Rigid MOLLE frame for support Large main compartment Zipper near bottom allows you to remove sleeping bag without unloading bag Side cylindrical pouch 2 sustainment pouches Padded shoulder pads Fully adjustable support system Molded waist belt 22" x 20" expandable width Main compartment is 18" x 8" x 24"h.