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I carry a Nite Ize Doohickey but it's 90% box tape cutter and 10% bottle opener. Not sharp at all but I haven't tried flying with it.

https://www.niteize.com/product/DoohicKey-Multi-Tool.asp

For the clueless like me, it has nothing to do with baby food (https://www.gerbergear.com/en-us/shop/multi-tools/all-multi-...)

> opens cardboard boxes [...] cuts strings

How does that work? I looked it up and it doesn't seem like it has a knife. (Not that you'd want something that sharp in your pocket unprotected anyway.)

The little “v notch” that they call a wire cutter is sharp enough to go through packing tape. Not sharp enough to bother you though, any more than a house key on the same ring.

It’s not a tool I’d use to break down 1000 boxes a day, but it’s fine for an Amazon box or two.

For the same reason I keep a Swiss+Tech ST53100 Multitool on my keys. It's as long as a key, and like your tool it doesn't have a blade so is airport- and government building-safe.