Wallet SD Card Holder

This is a very simple SD card holder, the size of a credit card, which fits in a wallet. It's designed to be slim so that it should be able to slip into any credit card slot. It holds two standard SD cards, one mini-SD card, and one micro-SD card. Mini-SD isn't very popular as far as I can tell, but I didn't think anyone would need TWO spare micro-SD cards so I went with the mini instead.

The general idea is that you can carry spare cards for your phone, camera, or whatever. [Actually, if an