The TrailControl bike backpack with over 20 liters features the namesake Aeroflex Control System - quite literally! With this carrying system, you have a ventilated back while pedaling uphill. At the trail entrance, simply pull on two loops, and you have a contact back with the center of gravity comfortably close to your body. The back length can be adjusted continuously. Storage space includes a large main compartment, mesh pockets on the sides, and a zippered pocket on the right hip belt wing. When wearing a helmet, you can also transport additional items in the helmet compartment. Organizational options include a tool pocket, an organizer, and a key ring. It features side compression straps, a chest strap, and a hip belt, as well as reflective elements. A rain cover is included. The material of the TrailControl bike backpack is equipped with Eco Finish, making it water- and dirt-repellent. VAUDE avoids the use of fluorocarbons, known as PFAS or PFC chemicals, which are suspected to be harmful to health.