Inside, three compartments including an organizer ensure clear storage. Books, notebooks, and personal items can be neatly stored and are quickly accessible. An expandable outer pocket sensibly increases storage space, for example, for a water bottle or an umbrella. Reflective elements enhance visibility in traffic and contribute to greater safety on the way to school. The ergonomic carrying system is based on the proven Your Size System. The back panel is adjustable in height and can be adapted to body sizes from 1.40 m to 1.80 m. This allows the school backpack to grow with the child over several years and supports a balanced weight distribution. The ergonomic design helps relieve the back and shoulders in everyday life. In terms of sustainability, the model meets clear requirements. Sustainable textiles are used in its production, consisting of up to 100% recycled PET bottles. This Air is made from 14 recycled 0.5-liter PET bottles. The outer material is made of 100% recycled polyester and is waterproof with a water column of 1,500 mm. Additionally, it is dirt-repellent and PFC-free treated. The inner lining is made of 100% polyester, complementing the durable construction. Care instructions: Do not wash, do not bleach, do not tumble dry, do not iron, and do not dry clean. The Air school backpack combines a lightweight concept with ergonomic adaptability and sustainable production, making it a functional companion for everyday school life.