The only downside is that it’s so small I can forget it’s there. Until I’m passing through airport security. Sometimes I remember to take the thing off my key ring before leaving the car. But sometimes I don’t. In the last decade or so, I’ve forgotten to do this about six times. Three times, it has gone through TSA inspection undetected. (And done so both going and returning, which is something I can’t begin to explain.) The other three times, it has been found by a TSA inspector. When this happens, the agent takes it to a secure location, and drops it into his own pocket. Then, once a month, all the local TSA inspectors get together at a cookout to play Who Got the Coolest Knife This Time. Each time, I’ve had to replace it.