Durable & Water Repellent: This hiking backpack is made of water repellent 400D polyester fabric, and the YKK zipper is smooth and not easy to fall off. Large Capacity & Multiple Compartments: The backpack has a capacity of 40L. 1 main compartment can hold a 16-inch laptop, 2 zippered front pockets allow for quick access to items, 2 side pockets can hold water bottles. Comfortable and breathable: This travel backpack has breathable mesh shoulder straps and back panel, and is equipped with a large amount of sponge to relieve shoulder pressure. The chest clip with whistle buckle can perfectly disperse the weight of the backpack and keep the backpack stable and centered. Perfect Design: There is a compartment in the main bag of the backpack for a water bladder, so that you can have sufficient water when hiking outdoors (WATER BLADDER NOT INCLUDED)