NEW FOR 2018 Waterproof, ultralight packing organization at its finest, our new BlockerLite Compression Dry Sack protects essential backpacking and hiking gear like clothing and sleeping bags, while the Continuous Compression system reduces overall volume for maximum packing efficiency. Ultralight: Featherweight 20D silicone- and polyurethane-coated nylon delivers waterproof protection while barely tipping the scales. Smarter compression: Unlike conventional systems that pull against seams, our Continuous Compression system encircles the sack to minimize seam strain, maximizing durability for dependable protection. PurgeAir-equipped: Our unique and waterproof PurgeAir valve vents trapped air, helping the sack compress further after being sealed, and is both more durable and more reliably waterproof than waterproof/breathable fabric membranes. Waterproof closure: Roll-top closure features a wrinkle-free stiffening strip to ensure a secure seal when closing the dry sack. Durable construction: Fully welded seams result in stronger and more durably protective construction compared to sewn-and-taped seams. Efficient-Packing: PackTight packing system sacks feature flat-sided, rectangular shapes that nestle closely together, packing 20% more efficiently than rounded sacks for easy, space-saving organization. Weight 2.8 oz, width 3.5 in, length 6.4 in, height 11.8 in, volume 305 cu.in. Watertight roll-down closure. Made in China.
I have the 20L version and use it for my heavier down sleeping bag. It compresses nicely and the AirPurge is a great feature to get it down as small as possible. It's lighter than what I used before so that helps keep weight down in my pack, too. Doesn't need to be super durable since I'm just moving it from my bag to my tent and it's not getting beat up outside.