British Survival Water Carrier Mk 3. Issue survival aid for pilots and Special Forces. New Old Stock. Part No: 22P/514-4160. NATO Stock Number (NSN): 8465-99-514-4160. Tough, lightweight water bladder designed for extended survival/Escape & Evasion use. Fold over Velcro and press-stud closed neck. Webbing carry strap. Measures approximately 8 x 20 inches. Will hold approximately 1-2 litres of water/fluid. Takes up little space in a windproof smock pocket when empty. Handmade in England by Beaufort Air-Sea Equipment to MOD specifications. Exterior glue marks from manufacture. Suitable for extended military, mountaineering or expedition use.