This product is a combination of luggage and sorting boxes. The pull rod and the universal wheel are accessories, which are detachable. The railing is retractable, and it is small and does not take up space. Luggage is not a product we often use in our daily life, but it takes up more space at home. Both the suitcase and the sorting box can store items, so I combined them. When you want to use the suitcase, you can install the four universal wheels and tie rods on the sorting box, and remove them when not in use. There are baffles inside the finishing box, which can be selected according to your needs and the location. The box has three sizes, large, medium and small, and the accessories universal wheel tie rod and partition are uniform sizes. There are many different colors in the series design, which can be washed diy according to yourself.