How to you like the rolling one for the bottom? I liked their system for tools but I didn't like that you had to take off the lid completely on the big one to get inside.
I like it - I wanted to be able to get a full set of tools in the trunk of a civic so this system works for me. I don't mind the lid coming off completely; I flipped it upside down and used velcro to attach straps over the honey-comb type compartments that provide the strength so it can hold small containers and rolls of duct tape. So I basically turned it into useable space. I wish Rigid had thought of the idea themselves so it would already be set up for it.
Dewalt has a similar system but it requires purchase and use of a separate metal hand-truck. It's nice but much more expensive and the hand-trucks would never have fit in my trunk.