On my person I carry a Rayovac penlight, Winchester-brand multi-tool, S&W Homeland Security folding knife, pocket "tweaker" screwdriver, Sharpie, pen, lighter, and 2 cellphones. In my company van (which is always close by) I have my SHTF which has pretty much everything I could need for any situation.

I design/build/service large commercial fire alarm systems, so some days I'm in an air-conditioned cushy office and some days I'm knee-deep in mud on a construction site.