The Schnozzel Pumpbag ensures quick, hygienic, moisture-free inflation of Exped mats, preventing mold development and maximizing insulation (because wet insulation is less effective).It also serves as a waterproof compression drybag to keep your sleeping bag and clothing dry.If you have a competitors ‘stick-out’ valve, a flat valve or any older Exped valve, use the Universal Valve Adapter or FlatValve Adapter. Some competitors flat valves connect directly to the Schnozzel Pump Bag, because their inflation port diameter is also approximately 20.5 mm.