You close this hiking backpack with a buckle, lid, and zipper. Several materials have been used to make this bag, among them polyester, and it has a 14-litre volume.
From Outdoor Action
Deuter AC Lite 14 SL Rucksack: Graphite Colour: Graphite
Lockwoods
Deuter - AC Lite 14 SL - Graphite/Shale