The new eVAC™ Dry Sack is a slimmed down version of our award winning eVENT® Compression Dry Sack. We use waterproof, air permeable eVENT® fabric on the base for valve-free air expelling, allowing compact packing. Instead of straps for compression, you just roll the sack down and air is pushed out of the base. Then close the buckle and you’ve just saved space and weight. The sack is oval-shaped, rather than round so they resist rolling when laid on their side.