Osprey Transporter 30L Waterproof Roll Top BackpackTransporter 30L Waterproof Roll Top Backpack Downpours don't mean anything to our Transporter Waterproof, designed to handle anything your adventure may throw your way. The Transporter Waterproof 30's IPX6 roll top closure keeps the elements out while simple internal organization keeps up to 30 liters of gear, inside and in place. A multi purpose internal compartment fits up to 13" laptops and devices. We've also applied our comfortable AirScape