To ensure high comfort during use, the bag features an elastic band inside to keep the heaviest books closer to the back - for better posture. It also has an ergonomically shaped back frame and adjustable shoulder and sternum straps. Inside, it is possible to attach keys or LEGO® wallets with the interchangeable buckle system. It is made of durable PVC-free material and water-repellent material, while it has reflectors on all three sides ensuring high visibility in traffic.