The Sea to Summit eVac Dry Sack utilizes 70D lightweight nylon fabric for strength and eVent waterproof fabric on the base to allow eVac-uation of air for compression. It's an excellent option for storing and compressing clothes and sleeping bags without the use of straps. Just pack the items in, roll the sack down and push the air out to save valuable packing space within your backpack. They're an oval shape, making them perfect for sliding into the contours of your pack and all seams are double stitched and tape-sealed.Highlights: Durability: Light abrasion and puncture resistance. No need to baby them, but be aware of your surroundings Waterproofness: Can handle serious rain, but avoid full submersion Best Use: Backpacking, Travel and Bike Packing What this bag could hold 8 liter: a puffy jacket & a sleeping bag or 2-3 days of foodFeatures: Air permeable, waterproof eVent fabric base Valve-free air expelling design for compact packing 10,000mm hydrostatic head, lightweight durable Nylon fabric Waterproof Hypalon roll-top closure does not wick moisture Waterproof seams - double stitched and tape sealed Reinforced stitching on stress points Space saving, low profile, streamlined shape Oval base resists rolling, stays where you put it Features the patent-pending Field Repair Buckle with stainless steel pins Specs: Size Variation: 8 liter Length: 8" Width: 5" Height/Depth: 17" Weight: 2 oz Volume: 488 cu in