Quality & Durable: This 2-piece children's trolley case set is made of durable and non-toxic ABS material. Quality materials guarantee the health of your children. In addition, the hard outer casing is less prone to wear and can effectively prevent scratches. Flexible for Kids: Children can adjust the height of the handle according to their own height, which is very convenient. The shoulder strap on the backpack can also be adjusted according to the kids’ figure and shoulder width. Ergonomic Design: Our kids luggage set is ergonomically designed for children. The widened shoulder strap of the backpack reduces the pressure on the children’s shoulders, and the omni directional wheels of the trolley case allow the children to move the entire box easily.