Ortlieb says about the Duffle 60
Expedition and travel bag with removable padded shoulder straps. Can be worn as a backpack: TIZIP zipper with large opening for optimal inside access: can be secured with a lock (not included) or using a wire clip on the zipper: 2 inside pockets: compression strap inside: outer mesh pocket (not waterproof): 2 Daisy Chains on the top: reinforced bottom.