Overboard 20 Liter Blue Waterproof Laptop Backpack 100% Waterproof Roll Top Backpack Floats safely if dropped in water. Protect contents from dust, sand, dirt and water! Fits up to 17" Laptop. Unique 'High Frequency' welded construction with2 way closure system (top or side). Padded shoulder straps and lumbar support with comfortable back panel with air-flow design and adjustable sternum strap and waist belt. Elasticated front webbing, 2 webbing side pockets, top carry hand and super reflective front patch Industry First - an internal zip pocket.