aLokSak Waterproof Touchscreen Laptop/ Large item Bag 3-pack - No BPA Waterproof: U.S. Military tested and SSI certified to 200ft / 60m Hermetic seal: airtight seal preventing the re-entry of air and micro -organisms Safe: FDA approved for food and biohazard storage Remains pliable in weather down to -40F / -40C Contains 3 different sizes: 12 x 12 inches, 13 x 11 inches, 16 x 24 inches