This 2025 new arrival Coolbaby patent shock-absorption ergonomic school backpack is a hot sale choice for parents, specially designed for primary school students in grades 1-6, with S/L sizes to fit different heights. Equipped with a national utility model patent elastic load-reducing system, the 3D zoned massage shock-absorption back pad + spring buffer structure scientifically disperses pressure on shoulders, back and waist, effectively offsetting the impact from bag swaying, protecting kids' spine health and preventing hunchback and uneven shoulders. Made of high-density Oxford cloth, it features excellent wear-resistance, tear-resistance and water repellency, easily handling rainy commutes. The lightweight body weighs only about 2 water bottles, adding no extra burden to kids. The elastic book strap and foldable L-shaped load-bearing base double-fix books, eliminating bag swaying and sagging, fitting kids' back perfectly. With a scientific layered design, the large capacity easily holds textbooks, stationery, water bottles and more, keeping items neatly organized. The widened and thickened shoulder straps + H-shaped chest buckle with safety whistle prevent slipping, and the 360° reflective strips fully protect kids on their way to and from school, making it an ideal companion for students!