I am not big on multitools. They are awkward to use and rarely contain just the tools you need. I carry short 4mm & 5mm hex wrenches, which cover the majority of emergency repairs. I sometimes also carry a small Park CT-5 chain tool. I have been looking for a portable Phillips screwdriver for derailleur adjustments, but could not find anything I liked -- heavy enough to do the job yet small enough to go in my CamelBak without poking a hole in it.
So, I purchased a Tekton 2-in-one reversible-bit Phillips/Straight pocket screwdriver and modified it. They are readily available on EBay or Amazon, but you might find one or something similar at an auto parts or hardware store. A simple modification, and I have a great small, portable screwdriver at low cost.
Cut the bit in half, and bevel the edges where you cut.
Next, you need to put a spacer inside the handle. If you don't the bit will push almost all the way into the handle. You need to insert something in the hole to stop the bit soon after it passes the metal socket insert. I found a ball-point pen with a larger-than-normal ink tube that nicely fits thru the hex socket insert. Sorry, I do not see any brand on it. Cut off about 22mm of the ink tube to use as the spacer. Unless the pen is brand new, it won't leak ink or damage the pen.
There is an o-ring in the handle that prevents the bit from falling out. Remove it with a crochet hook. Drop the spacer into the hole, then reposition the o-ring, using your crochet hook. The spacer will rattle around inside the handle, but the O-ring will prevent it from falling out. Position the O-ring above the metal insert so that the bit will go thru it when inserted. The handles come in red and black. If you have a red handle, you can hold the handle up to a flashlight. The light will filter thru the plastic and illuminate the inside. I don't know if light will penetrate a black handle.
If you plan to use these screwdrivers as-is, check the position of the o-ring. They are often installed improperly from the factory, resulting in the o-ring getting pushed to the top of the handle and no longer holding the bit.
The weight is 15 grams with one bit, and 25g if you carry both. I still need to paint the bit (and my Allen keys) bright orange in case I drop them in the leaves.
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Thread: Compact Portable Screwdriver