Introducing a completely new concept in compression dry bags no valve. This innovation uses an air permeable base made of eVent waterproof fabric, which allows air to be pushed out of the sack, but won't allow water to get back in.Winner of Backpacker Magazine 2007 Editor's Choice Award. Recommended for kayaking, canoeing, and general boating. Unique compression idea allows air to be pushed out to compress, but water can't get in because of the waterproof, air permeable eVent fabric base. Rugged 70D nylon body lid. Waterproof seams double stitched and tape sealed. Roll top Hypalon closure with lid and 4 straps evenly compresses and maintains compressed size. Reinforced stitching on all stress points. Pull handle on the bottom.