KastKing Downpour Floating Waterproof Dry Bags, Silver Mist Backpack, 30L

From Amazon: KEY FEATURES – 100% Waterproof – Tough and durable triple layer military grade construction – Molle straps are included so you can lash the bag to a kayak, bike, or ATV. Or, you can quickly strap coats, hats and accessories to the exterior of the pack - Ergonomic shoulder straps offer comfort and spread the load evenly for longer hikes. Includes two carabiners to clip gear onto the exterior of the pack. 100% waterproof - KastKing’s unique CycloneSeal closure system provides the ultimate waterproof seal. An extra layer of lining material temporarily bonds to itself as the top is rolled down and buckled in place, creating a complete seal to prevent any water leaks. MILITARY GRADE Construction – Triple layer construction is up to 10 times stronger than other dry bags. The .65mm thickness is twice as thick as standard dry bags providing extreme puncture and abrasion resistance. Waterproof hi-vis interior PVC layer makes it easy to find your gear in low light conditions. Proprietary camo layer is puncture and tear resistant, and the exterior clear PVC layer is waterproof and abrasion resistant. High frequency welded seams ensure 100% weatherproof storage.