The Pumphouse Ultra drastically reduces the time you have to spend inflating your sleeping pad. The bag collects a large amount of air at once and you easily press it into the sleeping pad through the valve. You can also use the bag to store your belongings in your backpack, as a water tank or even as a pillow if you fill it with something soft and comfortable. Works with all sleeping pads with traditional valves, but is designed to fit best with Big Agnes Ultra, AXL Air and Q-core models. Not recommended for smooth use with the Double-Z model.