The new Sea to Summit Ultra-Sil® Dry Sacks are more than 50% lighter than our super popular Dry Sacks. They’re made of Siliconized Cordura®, which is one of the lightest and toughest waterproof nylon fabrics available. Now you don’t have to choose between keeping your gear dry and keeping it light. A Backpacker magazine Editors' Choice Award Winner! Super compact and ultra lightweight. Made of Ultra-Sil™ nylon, a polyurethane coated Siliconized Cordura® for ultimate waterproofing and maximum durability. Non-wicking Hypalon® roll top closure with stiffener at the top for a better seal. Soft and flexible with a slippery finish for easy packing. Nearly transparent allowing good visibility of the contents. All seams are double stitched and tape sealed. Smaller sizes have flat bottoms, others are round. Colors: kiwi green, sky blue and orange.