ID card holder - single

I wanted a slim holder to hold my ID vertically, with a single hole for the lanyard in the top, but couldn't find anything that fit well, was slim and held the card securely.

This design holds the card on all 4 sides so it can't slip out, has a brace across the back to hold the sides rigid, and a little flap sticking down to catch the edge of your pocket if you so desire to get it out of the way.

I've found it easiest to slide the card up from the bottom, then clip the bottom tab over.