The Airstreamis Sea to Summits big-volume sleeping mat pump. Its based on their 20 litre Ultra-Sil® Nano dry sack with an added valve plug and foot loop. Using the venturi effect means the Airstreamcan be inflated with a single breath. Two to three cycles from the Airstreamare enough to fill our mats, meaning youre ready to go quickly, with minimal breath condensation in your mat, or dizziness from blowing the mat up. The Airstreamcan be used as a 20L dry sack, or as a vacuum bag to store your down sleeping bag. Inflates most sleeping mats in only two or three breaths Oval base design Fully seam sealed with sealable valve plug Made from lightweight 15D UltraSil® Diameter120 cm Volume20L Weight48 g