Feature: 1.Large capacity main body 2. Padded laptop pocket fit up to 15.6" laptop • Two-way carrying (vertically or horizontally) • Used with trolley case • Usb charging design • Washing waterproof bag 1.Large capacity scalable:one size thickness to 17cm, it can be expend to another type thickness to 25cm 2.The outside splash proof oxford cloth, the inside strong PE panel and smooth lining 3.Ergonomic design relieve stress , S-TYPE shoulder strap design, reduce the burden of science, comfort and lightness*Durable anti-theft multi-layer bag: This backpack is Made with high quality oxford fabric. It's a very durable ,Anti Theft, Water Resistant, Scratch Resistant, Professional design, strap with high density soft decompression foam for your comfort. *Durable anti-theft multi-layer bag: This backpack is Made with high quality oxford fabric. It's a very durable ,Anti Theft, Water Resistant, Scratch Resistant, Professional design, strap with high density soft decompression foam for your comfort. *Breathability: Padded Air cushion of the backside and shoulder strap reduce the pressure effectively. Adjustable buckle waist strap keep the backpack fixed on your body.It can use as a backpack in daily life and the soft top handle allows this bag convert into a handbag. Strap on the backside make it fixed on a trunk when you go on a long journey. *Separate laptop compartment hold 15.6 Inch Laptop as well as 15 Inch,14 Inch and 13 Inch Laptop. One spacious packing compartment for daily necessities.different pockets with different functions, mesh pockets ,pen pockets , make your items organized and easier to find. Best school supplies, laptop accessories and travel accessories for college students too. *Practical &Secure: A luggage strap allows backpack fit on luggage/suitcase, slide over the luggage upright handle tube for easier carrying.  Good travel accessories go with Carry On Luggage for Women Girls Men. Best gifts ,Best Choice. *Product Quality: We are committed to quality and inspection, but if there are any defects or flaws during the transportation and use of the product, please contact us immediately by email. I can correspond to the previous one.if you are not only interesting in our bag desgin ,but also wanna customrized your logo ,we can open the screen and make the sample according to your comment . Once all details be your satification , we can have further discussion for further business development ! Waiting for you ~