I have had my trusty Leatherman PST II (in it's original leather case) on my belt for about every minute of the last 17 or so years since I bought it. It's repaired everything from cars, to kids toys to battle damage on an F-16 (shh, don't tell, personal tools aren't allowed...) I rarely use the blade on it, but the pliers and various screwdrivers are used constantly. I also use the ruler marks inscribed on the side to make quick, rough, measurements of things.
I carry a Gerber folding knife in my left pocket to use on all my ordinary, daily things that require a sharp blade (opening boxes, envelopes, etc.) Nothing special, but it's a nice Gerber knife, keeps a good blade.
Lastly, in case I need something a little more, tactical, I carry a Spyderco Endura4 with a self made wood beaded lanyard hanging a little from my pocket to allow instant grasping. It takes and holds about the sharpest blade I've ever seen other than my Dad's old knife he passed down to me. I don't know much about it other than he got it back when he was a teen and entered the Air Force (60's) and it's stamped "Original Bowie Knife" on the blade and "Solingen" "Germany" on the base of the blade. It's a solid, thick blade and a bone/antler? type handle. I was able to sharpen it better than anything I've ever worked on; it floats through a sheet of paper without resistance. BTW, the leather sheaf it came with is in bad shape; anyone know where I might get a new one?