Credit card Knife
grabcad
Had an idea last night couldn't get out of my head so I did it up in the wee hours. I had a light duty blade I would carry around for small odd job stuff like cutting tape on boxes, chip bags etc. But having it in loose in my pocket was a pain. Sometimes literally It's aprox. 3x thicker than a credit card so it should still be able to be inserted into you wallet. Depends on how worn it is ;) Just don't forget its there before airport security!
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