Two-in-one 20-liter dry bag functions as both dry storage, and as a pump sack for Sea to Summit sleeping pads Inflates Sea to Summit air mats with just two to three cycles of air; can also be used as dry storage inside a pack Features a low-profile valve plug that is compatible with multi-function valve on all Sea to Summit sleeping mats Made from lightweight 15D Ultra-Sil Nano fabric; fully seam sealed Dry bag measures 12.2 x 9.8 x 27.6 inches and weighs just 1.7 ounces