The Air Stream is our big-volume sleeping mattress pump, its based on our 20L Ultra-Sil Nano Dry Sack, with added valve plug and foot loop. The 20 liter Air Stream can be inflated with a single breath. Two to three cycles from the Air Stream are enough to fill Sea to Summit sleeping mats, so youre ready to go quickly, with minimal breath condensation in your mat or dizziness from blowing the mat up. The Air Stream can be used as a 20L dry sack or ultralight pack liner. Features:- Inflates most sleeping mats in only two or three compressions- Oval base design- Fully seam sealed with sealable valve plug- Made from lightweight 15D UltraSilSpecifications:- Weight: 1.7 oz /48g