Thank you for viewing. I am selling this because I rarely use it. It has only been used for touring three times. It's very convenient because you can put anything in it. The top carrier is included, but I haven't installed it, so you'll need to drill holes in the box if you want to attach it. It's a simple task. [Capacity] 48L [Size] Box only: 56.5x43x30cm. [Material] PU+ABS [Easy to install] Comes with a mounting base. Most vehicles can be installed. 2 keys All screws and hardware are included. I will also include the screws I used. When shipping, I plan to remove the backrest and put it inside the box.