I need to have tools for work trips and sometimes mailing stuff in advance is not practical. One trick I figured out is to take apart a stanley utility knife with no blades. Put all the parts in a clear plastic bag so it could be seen easily in the security check, at that point it looks like a couple blocks of metal with the little razor holder and screw. Then when I got to where I was going, I find a Home Depot right near the airport. A 10 pack of razor blades is like $3 at the most. It's kind of a crude tool, but will work for 2 days.