6 colors availableBackpack size: 31x23x42 (length * width * height (cm)); weight: 1.5 kg; the rolling backpack is made of durable rubber solid 6-wheel design, sliding fast, not stuck, wear-resistant, also suitable for climbing stairsMaterial: high-quality thick nylon material, lined with polyester, durable, scratch-resistant, splash-proof, waterproof, and easy to clean.Large capacity: The spacious main compartment can hold textbooks, magazines, and A4 documents; 1 padded laptop pocket; 2 side pockets for water bottles and umbrellas; 2 front practical pockets for easy access to essentials.Comfort: The shoulder straps and back are made of thick padding, which is comfortable and breathable; the adjustable shoulder straps and sturdy handle make you comfortable to carry for a long time and relieve shoulder pressure. You can use the backpack with the trolley, or you can use it alone.Rolling backpacks can help students reduce the burden. The trolley has three levels of height and can be adjusted freely, which greatly meets the needs of your children. In addition, the trolley is foldable. It does not take up much space when not in use. A great gift for family and friends; every student needs a backpack.