We used the Stanley mobile tool box as a work site locker. There was plenty of room inside for us to stow our portable router table along with a circular saw, drill/driver, battery charger ...

These devices usually consist of a base tool chest on wheels with an extendable handle, making them look somewhat like chunky plastic dollies. You can then purchase additional units to stack on top of ...

You can then purchase additional units to stack on top of the base box and create a multi-level, portable tool storage system that allows you to transport your gadgets securely between job sites.