Big Agnes designed the Pumphouse Ultra to reduce the time it takes to inflate your inflatable sleeping pad by gathering a large volume of air before forcing it through your pad's valve. While not inflating your pad, it doubles as a water-tight stuff sack for your sleeping bag or as a comfy pillow when it's stuffed with clothes. It's compatible with the Big Agnes Air Core Ultra, Insulated Air Core Ultra, Q-Core, and Q-core SLX series pads, as well as most inflatable pads on the market. Its aviation-grade fabric is both incredibly lightweight and durable, so you'll barely notice it taking up room or adding weight to your backpacking set-up.