Sea to Summit eVent Compression Dry Sack nylon X-Small: 6 x 14; Small :7" x 16"; Medium: 8" x 18"; Large: 9" x 20"; X-Large: 10.5" x 23" Volume: 6 liter max/ 2 liter min Unique compression idea - allows air to be pushed out to compress, but water cant get in because of the waterproof, air permeable eVent fabric base Roll top Hypalon closure with lid and 4 straps evenly compresses and maintains compressed size Waterproof seams - double stitched and tape sealed