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