not hardly tactical, but I carry a streamlight stylus pro in my shirt pocket most everyday.
Handy to have.
This^^^^^
I carry one at all times. T shirt pocket or even clipped between the bottom buttons of a polo shirt. Light, handy, and bright enough. I even carry it clipped to the waistband of my boxers when I'm up in the middle of the night.
And I'm a headlamp addict too. Not unusual for me to have one on my head all day long. great for poking around in dark pole shed corners and basements.