Seeing all the kits here that use 1/4" hex bits, it reminds me that my current kit(s) are descendants of descendants of a bit-focused multitool I obtained from Mr. Rodriguez at R+E Cycles back some indeterminate time in the late 20th Century. Don't know what happened to the actual original tool, but it sold me on the bit-based concept for travel tool kits - and for painting said bits bright colors when they decide to unexpectedly strike out on their own by the side of the road.

All that being said, for shop work I don't like using bits, as they take too long to swap out. Instead, I prefer a multitool with 2-6 mm Allen wrenches with longer shanks + a slotted / #2 Phillips bit that fits nicely in the apron while I'm working. That and a 8-9-10 mm nutdriver Y wrench takes care of about 2/3 of what I need in a typical shift, although I'll readily call upon dedicated tools as needed.