Vietnam Flotation Bladder MK 1 MOD 0. Bladder is original GI Vietnam Issue with a stamp dated 02/14/1967. Bladder says Pan Avion, When Fully inflated bladder provides buoyancy varying from 110 lbs for a man to 12 lbs for average cargo. Has to looped straps on each end and hose to blow the bladder up. Great collectible for museums, personal collection, etc. New.