This lightweight Hiking Backpack is made of high quality tear and waterproof fabric, which can provide strength and long-lasting performance with the ultra light weight. 40L of storage rucksack, convenient to put all your outdoor items in this travel backpack. We take comfort and functionality into consideration when designing. The breathable mesh shoulder strap helps relieve stress on your shoulders. The length of the shoulder strap is adjustable. Adjustable chest strap with whistle buckle helps you hold the backpack securely, not easy to fall when walking or running.