Large capacity backpack: 41 x 30 x 11.5 cm. There may be errors (1-2 cm) during the actual measurement process, and the actual size is subject to the specific product size. High-quality fabric: The backpack is made of high-quality polyester fabric, which is tear-resistant, scratch-resistant, 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, the shoulder straps are made of a three-dimensional mesh structure and multi-layer sponge to ensure optimal pressure relief and comfortable carrying. Applicable occasions: Suitable for all occasions, such as daily school, outdoor sports, shopping, fitness, parties, picnics, or travel. When you go out, you can put all kinds of items you want to carry in the backpack. Customer service: If you have any questions about this product, please contact us and we will reply to you as soon as possible within 24 hours. I wish you a pleasant shopping!