DryCASE Waterproof Backpack: * 100 percent waterproof main compartment * Water resistant zippered outer storage * External zippered mesh pocket for your wet gear * Mesh side pocket/drink bottle holder * 2-way valve for inflation of compression * Padded shoulder straps * Top hold handles * Waist/hip support * Lower back padded support * 30 liters of storage capacity * Main compartment is perfect for holding laptops and other large electronics that are up to 12" wide