I use the Key-Bar
Expensive as shit, but very high quality. Basic model is 45 bucks, but you can have all this shit if you need extra stuff. I have read reviews of cheaper knock offs but people say they unscrew themselves and they find their keys all over the ground eventually. Cannot have that as I am very paranoid about my keys and wallet and must have them attached to my belt somehow. Yes, I wear a wallet with a chain also.
I had to get one because I was scaring the shit out of people at work who thought I was a boss checking up on them when then would hear my keys clanging on my belt.
Solved the problem, however will not fit my car key. No biggie. Now the same girls who accused me of scaring them, accuse me of sneaking up on them oddly. (Not a perv)