Within the US, a hex wrench is actually okay if the tool is less than 6" long fully unfolded, iirc. At any rate I no longer hesitate to travel with a bicycle multitool carry-on. I’m actually a little surprised a potato peeler isn’t okay.
Notable recent experience in the realm: on Monday the TSA did a hand check of my bag because my porlex hand coffee grinder looked weird in the xray scan. Was fine once they saw what it was. (No blades on that at all, just burrs.)
Though you know what they say, only a good guy with a burr grinder can stop a bad guy with a burr grinder.
