School backpack with detachable trolley. 2 uses in 1: the use of a fixed trolley with a sturdy base and the other use ofjust a backpack, since it can be separated from the trolley through the zipper that joins them. It has two big compartments and a front pocket with an internal organizer. Ergonomic breathable foam straps with velcro at the end thatadhere to the back so they do not drag on the floor. Pocket on the right side to carry a bottle. Padded top grip handle.It has a hidden lining in the back of the backpack to cover the two wheels and thus prevent the back from getting dirty.