①. Multiple Pockets: The main compartment of the backpack has separate mesh pockets, spacious enough. Different and internal compression elastic bands to keep things well. Easy to find things or any small items. The external pockets on both sides can store water bottles and umbrellas. ②. Expandable and Large Capacity: This large travel backpack features an expandable design, providing a larger capacity of up to 40L. The front compartment has various pockets to store laptops, pens, headphones and other small items, which can be opened and closed 180 degrees for access. Enough space for a 17.3-inch laptop. ③. USB Port Design: With USB charging ports on the outside, this USB backpack makes it more convenient to charge your phone on the go. Please note that the USB charging port is a convenient charging channel, it will not charge itself. ④. Practical and safe: This men's backpack is made of waterproof and durable nylon fabric, polyester and metal zippers, the metal zippers of the travel backpack can be locked to your or valuables from theft, the foam-padded top handle allows you to carry it comfortably for a long time. ⑤. Durable and comfortable material: The backpack is with waterproof material and matching sternum straps, the luggage backpack can effectively reduce the pressure on your shoulders and neck, and also reduces the pressure on the zipper. The padded foam handles and shoulder straps provide more comfort when carrying for a long time. ⑥. Capacity: 40L ⑦. Flap opening: zipper ⑧. Material: Oxford cloth ⑨. Style: Commuting ⑩. Lining texture: polyester ⑪. Number of shoulder straps: double ⑫. Carrying parts: soft handle ⑬. External pocket type: internal patch pocket ⑭. Carrying system: curved shoulder straps ⑮. Color: black ⑯. With or without back cushioning: Yes ⑰. Waterproof ⑱. Computer size: 17.3 inches 15.6 inches ⑲. Backpack size: 46 * 32 * 18 cm (expanded size 28 cm)