I carry my leatherman and accessory pocket sheath at work, and instead of a reversible pocket screwdriver I carry this bit ratchet.
This version is the GM powertorque from O'riley auto parts but it's the same manufacturer ( HI-FIVE in Taiwan) as the Icon, MAC, Facom, all of the VIM bit ratchets...etc. there's too many to list but this style variant is most offered by bicycle tool kit brands like Topeak.
I like it much better than the box wrench style because it can carry another bit in the end of the handle.
I find it to be an excellent alternative to a pocket screwdriver when driving screws is the sole purpose, I get probing and picking with a pocket driver which this won't do.