Roll-top 100% waterproof backpack | Floats safely if dropped in water Protects contents from dust, sand, dirt and water * Large outer elasticated mesh side pocket and a top carry handle | Large internal zip pocket * Unique "High Frequency" welded construction Two-way sealing system (top or side) | Padded shoulder straps and lumbar support * Comfortable back panel with air-flow design | Elasticated front webbing | Adjustable sternum strap and waist belt * Super reflective patches on the front of the bag and both shoulder straps