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Sea to Summit Ultra-Sil Dry Sacks are more than 50% lighter than their super popular Lightweight Dry Sacks. They're made of Siliconized Cordura, which is one of the lightest and toughest waterproof nylon fabrics available. The best thing is that they took their award-winning Sea to Summit Dry Bag Backpack and added a window so now you can see on the inside with little to no weight gain. Now you don't have to choose between keeping your gear dry and keeping it lightFeatures: