Here's a small set I keep in the car.
There is a tiny but bright LED flashlight, 10mm swivel socket, 1/4 socket, screwdriver bits, 4mm hex bit (very common), hex-to-1/4" drive adapter (so I don't have to include a ratchet) single-edge razor, full-size Leatherman, bits, driver, ratcheting screwdriver, tape and zip ties. The needle-nose and lineman pliers stay in when I remove the Leatherman for other quickie jobs.