The Cycle 28 is the ideal companion for bike commuters who want a secure bag attachment during the ride, but also want to carry the bag as a backpack on the train, bus or on campus. The bag attaches to your gear rack with QMR hooks (e.g. TSA lock, not included) that can be locked and can be converted to a backpack in a breeze. Just open the two vertical zips and the entire system can be stowed away in a compartment with hook and loop closure. A sewn in, easily removable label explains how to convert the bag in just a few steps. But this smart backpack-bike bag combination offers even more. Compared to its smaller brother, the Cycle 20, it has a much larger main compartment that can hold DIN A4 documents, a water bottle, snacks and a change of clothes. A separate padded compartment with zip closure accommodates laptops up to 15.6". A compartment extending across the entire front opens diagonally and provides a mesh organizer for your phone, keys and wallet. This compartment also has a flat mesh pocket for fast storage of a magazine or wet clothes. Two side compression straps, a helmet holder and reflective elements attractively integrated into the design round off the bag's convenient features. The primary material consists of 50% recycled polyester, the contrast material is 100% recycled. Our quick-change artist features a PFC-free water-repellent treatment, Eco Finish. The VAUDE Green Shape label stands for environmentally-friendly, functional products made from sustainable materials.