Sea to Summit's Seam Sealed Stuff Sacks feature all the things you’d want in a stuff sack. The 100-denier, 10,000 mm waterhead rated nylon we use is the ultimate in storm proof fabric for stuff sacks. Not only is it super strong and lightweight, but is waterproof to give you added protection from light rain, snow or soggy pack fabric. They’ve got a handy Hypalon® clip-in loop and an ingenious single-hand operation draw cord closure. Like our Dry Sacks, the lining is white so you can more easily identify the contents of each sack.