Satch Airtwist: ergonomic backpack for teenagers combining trendy fashion and ergonomics. Ergonomic Concept of Satch Ergonomic Design Satch backpacks combine the principle of innovative trekking backpacks with everything required of a school bag. All ergobag school backpacks follow the principle of optimal load distribution, a principle used by professional hikers for years. The school backpack sits comfortably tight on the body. The back panel (5) is stabilized by two ergonomic aluminum rails. It is adjustable to the back length (4) of the student. The waist flaps stay where they belong: at the waist. This is important in order to take the strain off the back and to shift the weight. The chest strap (3) is also adjustable to the height of the student. It helps position the shoulder straps comfortably. Customizable to the individual: the satch is adjustable for teenagers and adults up to 180 cm in height. The ergonomic principle at glance (see image above for guidance) 1. Ergonomic aluminum rails 2. Waist strap with padded flaps 3. Height-adjustable chest strap 4. Continuous adjustment of the shoulder strap to the length of the back 5. Breathable back padding 6. Compression side straps to bring the weight closer to the back to reduce gravity pull. Dimensions: 30 x 22 x 45cm (W/D/H) 1200g . 30L Volume