Overboard Classic 100% Waterproof Backpack Dry Bag 100% Waterproof - Roll-top fully waterproof backpack, floating safely if dropped in water. High frequency welded construction - Providing perfect protection from dust, sand, dirt and water. Padded shoulder straps and lumbar support - For a comfortable fit and feel when carrying even if fully packed. Ventilated back panel with air-flow design - For enhanced ventilation to keep you comfortable and dry. Lightweight straps - Comfortable and buoyant construction, including a ventilation system keeping you dry whilst on the go.