Nothing ruins a vacation faster than having to surrender a beloved pocket knife or bladed multi-tool to the TSA before you even board your flight.
Alas, this calamity happens so often, the TSA finds itself offloading thousands of deeply discounted knives and multi-tools through state-run thrift, consignment and surplus stores every year.

Thankfully, lots of brands sell defanged multi-tools that will never land you in this trap.
Given how often we forget we even have them on us, an un-bladed option is probably best for your keychain multi-tool, assuming it can still pack a punch.
One strong candidate in that regard is Gerber’s Driver, which — despite its small size and slim $16 price tag — boasts substantive screw-driving chops and additional handy functions, too.