I have carried a small pocket knife since I got my first Barlow when I was 10 years old. The one I carry now has about a 2" blade. I use it to open mail, open boxes, strip wire, as a screwdrive, etc., etc. I used to use it to pick my teeth on occasion, but age and the dentist removed that necessity. Luckily, I have not had the need nor desire to travel by air since 9/11/2001. I would feel pretty naked without my trusty little utility tool. But, if anyone wants to challenge me to a round of mumbletypeg, I'm ready.