Thank you for viewing. I am selling this as I rarely use it. It has only been used for touring three times. It's very convenient as it can hold anything. 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. Fits most vehicles. Two 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.