I see at least one at every race pop off someone bars. Granted these are people racing but since I can't afford such a piece of equipment I wouldn't dare take it on the trail. My husband's coach DNFd a race because his came off and he had to go off trail down the side of a hill looking for it, losing 10 minutes.
If you are only worried about being lost I guess putting it in the pack is a viable option?
Amanda
2011 Specialized Epic Comp 29er | Specialized Phenom | "Marie Laveau"
2007 Cannondale Synapse Carbon Road | Selle Italia Lady Gel Flow | "Miranda"
You don't have to be great to get started, but you do have to get started to be great. -Lee J. Colan