20 liter, single-compartment daypack, with tablet/ laptop sleeve This streamlined 20 liter Patagonia Anacapa pack is small but efficient in managing a day's worth of gear to keep you organized for a day out. Lid/toppocket with zipper, holds e.g. electronics, sunglasses or e.g. a wallet Stretch-woven side pockets accommodate a full range of water-bottle shapes and sizes Ergonomically shaped, padded shoulder straps and back panel; adjustable sternum strap Back panel length: 43cm. Width: 28 cm. Depth: 18 cm. ***side pocket does have small tear which I have repaired and have had no issues. If you are a REI member I believe they repair for free.