Siliconized nylon stuff sacks are super strong yet incredibly light. They're a great way to keep your backpack, kayak, or luggage organized. Made of 30D diamond siliconized Cordura. Three times lighter than typical stuff sack fabrics. The fabric is impregnated with silicone to make it waterproof to a pressure of 2.8 psi. Fabric has a slippery finish for easy packing. Reinforced pull handle on bottom. Uses the smallest possible cord and cord lock for top closure.