SPECIFICATIONSBrand Name: NONECapacity: 36-55 LitreGender: UnisexHigh-concerned chemical: noneItem Type: BackpacksLining Material: POLYESTERMain Material: POLYESTEROrigin: Mainland ChinaPattern Type: SolidFeatures:Carry On Backpack for Airplanes: Size of the travel backpack: 30x16x45cm, suitable for placing on the top or under the seat in airlines as personal item. This versatile travel backpack meets the carry on requirements of most airlines.USB Charging Port: The backpack waterproof business laptop daypack with built-in charging port enable to charge your phone anytime and anywhere.(the power bank and data cable in the pictures are fodisplay purposes, not gifts, need to be provided by yourself).Ergonomic Back Design: Comfortable back design can bring your travel a more pleasant use experience. The hiking backpack has a comfortable, breathable mesh filled back and shoulder strap, and a reinforced buckle on the front, reducing the pressure of the backpack on the shoulder designed for outdoor travel enthusiasts.Large Capacity & Expandable: This large travel backpack with expandable function gives you more packing capacity up to 39L. Zipper closure for more 40% storage space for 3-7 days travel. The main compartment is spacious for daily necessities, fits 6-10 garments. Large carry-on backpack with separate laptop compartment for 16 inch laptop. The multi-pocket design provides spacious space for pens, textbooks, wallet, clothes, shoes, bottle, etc., making your items organized and easier to find.Specifications:- Material: Oxford Cloth- Color: Black- Size: 30x16x45cm- After expansion size: 30x26x45cm