This tough, oversized field pack is built to rigid specifications. Although it is designed to withstand rigorous use by U.S. Forest Service Firefighters to carry equipment and other bulkier items, this pack has proven to be invaluable for just about any kind of heavy-duty field use. With its padded shoulder straps and cushioned back, this pack also makes an excellent recreational day pack. Made of tough 1000 denier waterproof nylon cordura. Large main compartment with draw-string closure. Additional compartment in top flap with heavy-duty YKK zipper closure. Built-in layer of olefin spacer material to cushion back. Padded nylon shoulder straps with Rubatex closed cell foam. Adjustable chest strap to secure shoulder straps.