Material description nylon，Product performance This backpack is made of high-quality ancient nylon. Suitable for super heavy and heavy backpacks. Suitable for school and outdoor use. In terms of durability, it has anti-shrinkage and tensile properties. Therefore, it also has wrinkle resistance. The backpack strengthens the bottom and high details. This ensures that the bottom of the backpack is firm, and reinforcement is added to protect the backpack. The backpack reinforcement strap adopts an ergonomic double coating and is reinforced with an adjustable shoulder strap. This provides the best comfort for your shoulders. The adjustable shoulder strap is very suitable for choosing the appropriate length of the shoulder strap to make the shoulder strap close to the shoulder. Make your back feel more comfortable. When carried, it can be placed comfortably on the back.