Phantom Aquatics Walrus 25 Premium Waterproof Backpack Dry Bag Roll-top 100% waterproof backpack, Floats safely if dropped in water Protects contents from dust, sand, dirt and water, Unique High Frequency welded construction Two-way sealing system, Padded shoulder straps and lumbar support Comfortable back panel with air-flow design, Elasticated front webbing Super reflective patches on the front of the bag and both shoulder straps, Large internal zip pocket