The upgraded back support schoolbag adopts a three-in-one force relief system of "lightweight, pressure distribution and load-bearing transfer", specially designed for the physical health of primary school students. Unlike ordinary weight-reducing bags, this model transfers the weight of the book from the shoulders to the back and hips through multi-zone force distribution, effectively reducing the pressure on the spine. Back core upgrade: Honeycomb 3D drainage groove back plate, hollow and hollowed-out structure, breathability far exceeds that of ordinary schoolbags. Wearing it on the back in summer won't make you sweat, reducing the risk of heat rash. Combined with high-density slow-rebound back pads, it absorbs the impact force during walking, running and jumping, protecting the tender spine. The S-shaped thickened shoulder strap fits the human body curve, and the anti-slip whistle chest buckle prevents the shoulder strap from slipping off. When running, the schoolbag does not shake, avoiding uneven shoulders. Detail configuration: High-density Oxford fabric with waterproof layer, wear-resistant and scratch-resistant; The 360-degree reflective strip increases the visible distance at night. The hidden folding base plate can support the schoolbag to stand upright and can also be compressed and placed on the desk. The main inner pocket, compartments, organ layers, front pocket and elastic side pockets help children store things in an orderly manner. The overall lightweight design makes the carrying experience feel just like a bottle of water.