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Ultra-Sil Dry Sack - 35 Liter size Sea to Summit Ultra-Sil Dry Sacks are more than 50% lighter than our super popular Lightweight 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. Features: Super compact and ultra lightweight All seams are double stitched and tape sealed · Soft and flexible with a slippery finish for easy packing · Translucent fabric allows good visibility of the contents · A Backpacker magazine Editors' Choice Award Winner! · Non-wicking Hypalon roll top closure with stiffener at the top for a better seal · Made of Ultra-Sil nylon, a polyurethane coated siliconized Cordura for ultimate waterproofing and maximum durability Proper Use: · Avoid contact with sharp objects or subjecting the sack to high abrasion, as this could compromise the waterproof fabric. · Any roll-top dry sack must be closed properly to ensure water can't get in. Begin by folding the Hypalon strip down first and be sure to have at least three rolls before closing the buckle. · Ultra-Sil Dry Sacks should only be used to store sensitive electronic devices when used in conjunction with another, heavier-duty dry bag - the double bag method. For maximum protection of electronics the use of a waterproof hard case with a mechanical seal should be considered.