I'm more interested in how you will carry new blades on the way out!
A used blade can be discarded semi-safely (wrap in some paper and put some tape). Or carry a blade disposal case from a blade that offers something like that (e.g. Feather/Derby) and use that to discard them before the return trip.
I usually put them in my checked luggage. If TSA is on the ball, blades are not allowed in your carry-on bag, and they'll confiscate them when they screen it.I'm going to be traveling for the first time since I started using a safety razor and based on what I've learned here, I'll have my razor disassembled and have a shave stick and a trial size vial for my aftershave in my quart size bag. I'm just wondering, what do you guys do with the used razor blades when you're ready to make the return trip home?