Our Bed Partition Toolbox mounts to the inside of the bed partition on our Humvee Rear Curtain, and sits between the two rear seats. It has a 13 gallon storage capacity. The base protrudes 12" from rear partition and tapers towards the top. The inside height is 9". The inside width is 46 1/2" at the widest and 22" at the narrowest. It is a great option for storing tool kits, jumper cables, tow ropes, etc.