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Features: 1. Ergonomic design, multi interlayer airflow, suitable for children and school students specifically. 2. Classic external, practical internal. Let your children find pleasure in learning. 3. Using high quality non-toxic ultralight Oxford cloth fabric, portability and highly tear resistant. 4. Waterproof, wear-resistant, super light, large capacity, reduced pressure. 5. Soft decompression back cushion design to protect the children and students' backbone. Please note: 1. The real color of the item may be slightly different from the pictures shown on website caused by many factors such as brightness of your monitor and light brightness. 2. Please allow slight manual measurement deviation for the data.