According to Shipai.com's inquiry, Cambridge Tree Schoolbag is a domestic schoolbag produced by Fuzhou Zongyue Trading Co., Ltd. Cambridge tree schoolbag is made of light material, which has the effect of reducing the burden and protecting the spine, and can better protect the health of children's spine. Cambridge tree schoolbag also has the exclusive invention patent GOA to adjust and reduce the burden system, which has the function of reducing the burden and protecting the spine by the Institute of Mechanics of Chinese Academy of Sciences.