Overboard 30 litre classic waterproof backpack description perfect for water sports and all types of activities the black 30 litre overboard waterproof backpack protects your gear from water sand dirt and dust thanks to a unique seamless construction and roll top sealing system our backpack is 100 waterproof and suitable for quick submersion so you can take it out on the water features roll top 100 percent waterproof backpack class 3 ip66 floats safely if dropped in water