Large capacity backpack: 16.1 X 11.8 X 4.5 inches (41 X 30 X 11.5 centimeters). There may be errors (1-2 cm) during the actual measurement process, and the actual size is based on the specific product size. High-quality fabric: The backpack is made of high-quality polyester fabric, which is resistant to tearing, scratching, comfortable, breathable, and easy to clean. The storage bag is made of cotton and linen fabric, which is durable and easy to store. Ergonomic design: According to the principles of ergonomic design, it consists of a shoulder strap composed of a three-dimensional mesh and multiple layers of foam to ensure optimal pressure relief and comfortable carrying. Applicable occasions: Suitable for all occasions, such as daily school, outdoor sports, shopping, training, gatherings, picnics or travel. When you go out, you can put various items you want to carry in your backpack. Customer service: If you have any questions about this product, please contact us and we will reply as soon as possible within 24 hours. Happy shopping!