The Box contains 10 (Ten) kits.......... PART # MILB51170 (NSN 4240-00-) The U.S.Military issued M1 Waterproof Bag keeps mask dry when required during excessively long periods of heavy rain, river crossings, beach landings and during similar operations. It is an essential to have in your gas mask bag. Each M1 kit contains one 4"x 6" carrier bag with an aluminum tab closing strip, One large 12" x 19" main bag, and a packet with three rubber bands. Originally issued during the Vietnam War and continually thereafter, these multi-use bags are thick and very durable................. EACH M1 kit contains one large 12" x 19" main bag, and a packet with three rubber bands