The one offered by LRI as an accessory to the Photon Micro Light flashlights is very nice. It has a good plastic snap-together break-away coupling to keep you from strangling and a very nice metal snap-hook for quickly attaching and detaching gear. They can be ordered individually at the LRI site and are affordable. I forget the exact price but about $4 with another $2 for shipping would probably cover it.<br><br>Otherwise you could just make one, maybe from some para cord or para cord sheath. Be sure to allow for break-away.<br><br>What you put on it is up to you. A whistle is common. A Photon, button compass, tiny knife would be good choices. A small vial if you need any critical medications. Maybe a big gold medalliion like Mr. T.<br><br>