Anything more than one used to make me thing...." why the hell..." but now i see the various uses. I personally usually hover around the number 3, why
-always a leatherman micra on my EDC key rig (seperate from my KEYS)
-victorinox huntsman plus or huntsman lite
-leatherman charge xi tool (black edition)
-sometimes i'll rotate out a gerber ar 4.0 depends on needs of the day/trip