After losing an expensive Benchmade folder that was clipped to a jeans pocket I will never use a clip to secure a knife again. All my knives now ride in a belt sheath or leather pouch in a deep jeans pocket. I use to work at an airport and I saw guys lose keyrings, knives and other tools, radios, hearing protectors and all manner of things they conveniently clipped to their belt or pants. We would have to inform the tower and close down an active runway and have a bunch of guys walk it and find whatever was lost. The guys in the tower were not amused. Neither were incoming pilots. I found a fitting once that had fallen off of a fire truck (and never reported). I took it back the the firehouse and they said "Where the HELL did you find THAT?" Out on Runway 27......... How would you like to be told that your knife was found inside an engine that costs $800,00?