Storm Sack dry sacks offer outstanding protection with a great balance of light weight and durability that makes them great for an impressively broad range of uses. Like our ultralight Cirrus Sack dry sacks, they deliver waterproof protection with minimal weight, yet offer added durability to handle tougher assignments. They can protect a camera or down bag from water, dirt and debris in your pack or keep your manky laundry from fouling up the clean stuff while bike touring Laos. A white interior adds excellent visibility to the contents. The 25L and 35L sizes are designed to accommodate a mattress or tent, while the oval-bottom 60L size is ideal for lining a backpack.