Smart Backpack is perfect & convenient for anyone on-the-go. Unlike an ordinary backpack, this backpack offers four-in-one utilities. Not only is it a backpack, but it's also a rolling backpack, duffle bag & lightweight dolly. Backpack easily slides onto luggage handles so it's ideal for travel. Oversize capacity bag at 24 lb. accommodates much more than a standard backpack. Backpack includes six oversized deep pockets & shook-proof back wall to store your 17" laptop safely & comfortably. Made of high-quality nylon, backpack is ultra-light, ultra-durable & strong with great breathability & flexibility.