The new Premium Trolley offers all the advantages of a removable trolley, with a greater ergonomics of movement and stability thanks to its large and silent wheels, with bearings. In addition, its front legs are opened with a carefully studied angle to prevent the car from tipping over. 2 uses in 1: All the strength and durability of a fixed trolley but now detachable so you can also use it as a backpack and wash it whenever you want.. Large wheels with off road bearings and a roll over system. Resistent bottom board School backpack with special thicker zipper and an internal organizer. It has ergonomic shoulder straps with breathable mesh. Wheels cover to avoid staining. Lateral pockets for water bottle. Top grip webbing and bottom union zipper.