YubiKey & Storage Card Holder

UPDATE:
I added an additional file for a card that holds 2 yubikeys and 2 super talent USB flash drives (which are about the same depth as a yubikey). If you have suggestions for other media let me know in a comment.

I made this because I use more than one Yubikey in my day-to-day. Thought this would be an alternative to having to carry my keys around all the time. It's about the same dimensions as a typical credit card and about .5mm thicker than the YubiKey.

It' seems to hold the key p