This transport box is ideal because the dog can enter either on the short or on the long side. They can therefore make the back seat or in the rear if required. Many details Z, B is there one bag in the pits for a leash etc. Box can be put together within a short side and is still stable. Since I have this box, my little dog rises like the car. Before that I had a stable transport box, which was only the long side to open and the little man did not want to like to enter. I would recommend this Box necessarily.