Bopai 68-01729 Large Capacity Canvas Lightweight and Breathable Student Schoolbag(Light Blue 2)1. Comfortable cotton filled straps to disperse and reduce pressure 2. Dispersed mechanical design, in line with ergonomic curvature, comfortable and comfortable, relieving shoulder pressure 3. Water repellent fabric, strong and wear resistant 4. Three dimensional breathable back, 4D three dimensional honeycomb high elastic cotton environmentally friendly material, shock absorbing, breathable and not stuffy 5. Snap type shoulder strap buckle, you can