This was built to enter in the weekly challenge (wheels.) It is made of tinker toys, a Tupperware container, and some cardboard. I assembled the tinker toys into a car form, then zip-locked down the Tupperware. The cardboard was then zip-locked down to the Tupperware. It rolls back and forth, and I am going to use it to set my tools on when I am working on something in my garage, so i don't have to carry them around.