This roll top backpack is made of 500D PVC, which makes it extremely robust and 100% waterproof. The roll down top provides extra strength and an unbeatable waterproof seal. Protects the contents from dust, sand, dirt and water. This waterproof backpack is perfect for boating, kayaking, paddling, sailing, canoeing, surfing, fishing, camping, beach, travel etc. Features: Waterproof backpack dry bag with roll down top. Rugged roll-top closure - Just put your gear in bag, grab top woven tape and roll down tightly 3 to 5 times and then plug buckle to complete seal. Multiple buckle roll top securing options. Unique splash-proof outer zip pocket safely stores small essentials. Spacious interior pocket is perfect for small personal items. Double adjustable shoulder straps. Specifications: Material: 500D PVC Colour: Dark Blue / Black Capacity: 25L Filled Size: 45cm x 28cm x 19cm Note: The front pocket is not 100% waterproof.