Ortlieb says about the Atrack Metrosphere 34
An understated, waterproof backpack for travel and short trips featuring structured, lightweight PU fabric: a large, lockable zippered opening on the back with reliable magnetic closures at the ends for quick access to 4 inside pockets: internal compression: Logo patch on the outside for address cards: 1 outside zip pocket: breathable, compact back padding with comfortable shoulder straps