I carry my
Leatherman Micra in my pocket because it's small and will do minor stuff. I gave up the full size Leatherman it was always in the way and I'd snag stuff when it was in the belt holster.
For events I wear one of those runners belts / waist / fanny packs. I have a different use case since I need special tools.
Mine has in it:
3/32 & 5/64 hex wrenches
11/32 nut wrench and nut driver
Needle nose pliers
Auto - Manual control switch
Wire ties
Small set of nuts and bolts
Bearing block
Axle collars
Band-aids
-- They are small and light and I've found that having the right tool is better than tool that's not quite right. You could match yours up to your robot (torx drives, fuses, etc.) and have the right stuff. Plus I can take it off so it's not snagging seatbelts and other stuff. YMMV
I also have what roboteers call my "Mary Poppins Bag", it's along the same line as items listed above, except there are 2 of each item, a full sized pair of scissors and one of those small hacksaw blade things. It's good for working with a team so more than one person can do things at a time.)