Orthopedic Children School BackpackSize: 29*15*40cm Cute and fashionable design,relieve burden and heat dissipation system, full thickness breathable massage cotton cushion, strong sponge back design provide comfortable carrying experience and prevent from spinal scoliosis, inclined shoulder, hunchback, spinal deformation Human Engineering: X shape back cushions,give upward lift force to the parts under power of kid's spine. Thick back cushion Air cushion,reduce stress. As parent,you