The eVac Dry Sack utilizes 70D lightweight nylon fabric for strength, and air-permeable eVent® waterproof fabric on the base. The eVent fabric lets you squeeze air out of the dry sack for more efficient space utilization inside a backpack. Pack your compressible items – sleeping bags, insulated clothing – into the eVac Dry Sack, roll the roll-top closure down, then squeeze the sack to push the air out. This function allows you to fit items into your pack or travel bag more effectively. They're an oval shape, making them perfect for sliding into the contours of your pack, plus all seams are double stitched and tape-sealed.
Pro-tip: sitting on a packed eVac Dry Sack is the best way to squeeze the air out – then pack the eVac Dry Sack into a tight space in your bag or pack so it does not draw itself full of air again.