Osprey Transporter 25L Waterproof Roll Top BackpackTransporter 25L Waterproof Roll Top Backpack When the skies open up, no need to hunker down with the Transporter Waterproof 25, made with 100% recycled materials. Its IPX6 roll top closure keeps the elements out while simple internal organization keeps up to 25 liters of gear inside and in place. Unlike other unstructured dry packs out there, we applied our comfortable AirScape backpanel, giving you a more stable carry. By foot, bike, board or boat,