The mPorter, iPorter, and iPorter xSD from ePorter are a series of small cases with designs reminiscent of PDAs and digital cameras that attach to your key chain. Each case stores a number of SmartMedia, Memory Stick, Memory Stick Duo, Secure Digital, xD-Picture Card or MultiMediaCard flash cards. The cases are made of anti-static polypropylene, and hold three cards in clips that allow you to flip through them to find the right card.