I had been carrying a small separate ratchet with my multitool. I removed it when I got the Leatherman ratchet accessory, but I've missed having a separate driver several times. So I went looking for a very compact driver handle to carry.
My thought was that I wanted something slim and short but with knurling to provide a secure grip. After spending quite a while poking around the web and looking at images without finding anything, I came across a nearly perfect answer: the Leatherman Bit Driver Extender.
It's just the right length, quite slim, but with nice knurling all along its body. It makes a perfect light-use driver handle when I need a second driver to use with my multitool. And it also works as an extender...
This was probably obvious to everyone else, but I'd rather be late to the party than not arrive at all. :-)