A fair number of Festool users use an empty systainer to carry the random stuff you need on a jobsite. But a lot of tools don't fit, or stick out and then you can close or carry the systainer. These toolboxes are specially designed systainers that only have a bottom, but also have a handle so you can carry and move it. Bolt your closed systainers underneath the toolbox, and pick up everything at once and go. Everything that doesn't have a place, or needs to be ready for instant access can be tossed in, a sort of disorganized organization. The smaller one is about 6" deep. The larger one is about 9 1/2" deep.