SD Card Organiser Credit Card Size Secure Digital Memory Card Case (Blue) The only credit card sized SD card holder/case of its kind! Never lose your digital memory card again! Get The World's Best SD Card Holder. This Credit card sized SD Card case alternative is the best available on the market. Available in Yellow, Purple, or Blue (separate Amazon listings) Also available for Micro SD, Multi SIM cards, and DS Gamepac for Ninento games