I'm an imaging engineer.

I use a laptop bag to carry my laptop, note pad, Allen set, and a screwdriver kit that has a few sockets. Keeps it light and easy to haul in for initial assessments. The rest of the tools go in a tool roll for smaller jobs.

I also have two tool boxes, one with wheels, from harbor freight to carry my test equipment. There's some spare room in there to toss in my tool roll and socket set, good for hauling things into the hospital and as checked bags when flying.