The Klymit Pump Sack (20L) is an effortless roll top pump for your sleeping pad. Using a pump instead of your lungs to inflate your product reduces the condensation in your sleeping pad and assists in quickly and efficiently setting up your camp. Simply snap the pump to your pad's valve, catch air in the pump, and roll the pump towards the valve to push air into the pad. Plus, the Pump Sack can double as a stuff sack for your sleeping pad or other gear. Compatible with the Klymit FLIP VALVE.