BACKPACK WITH BIG WHEELS: Rolling backpack have large wheels with a diameter of 7 inches (18CM) and a thickness of 0.86 inches (2.18CM). The backpack is very stable to pull and can handle heavy loads, saving labor and time. Easy thru airplane aisles and stair, without worrying about wheels turning sideways or backpack wear and tear 58L LARGE CAPACITY SPACE: Large rolling backpack size is 21.1*15.1*14.0 inch inches(53*38*36CM). The Padded laptop compartment with Velcro sleeve- 9.8*11*2 Inches(25*28*5CM) holds up to 16 inch laptop, as well as 15 Inch 14 Inch and 13 Inch laptop. Large main compartment roomy have 58L, hold 58 books, clothes, documents and folders. Wheeled backpack fit everything in it, contain all Kind of Books, Files, Pens, Computer, iPhones, Keys, iPads, Wallets, etc PERFECT DETAILS: Carry On Backpack have ABS Material Handle, better with time, no more worry about handle won't close.