Pack it in and pack it out with the PackOut Ultralight Stuff Sack. Our lightest stuff sack available this version of the PackOut has added durability thanks to a diamond ripstop with PU coating.. . 100% nylon 40D siliconized diamond ripstop with PU coating. . Water Resistant. Ultralight. Durable. Semi-Translucent. . Reflective Drawcord Cinch Closure. Designed for Ease of Packing