I did try a card size multitool for a while.
They still took it at an airport.
—”They still took it at an airport.”
I forgot about it once and the metal detector found it.
I said oh, my multitool! and thought it would be gone.
The woman said “I know what is”, and waved me on.
Our daughter forgot her Spartan and no such luck...
I purchased four of them on Ebay, for $15.00 with free shipping.