I have one of those tiny little USB storage thingies that's small enough I can keep it plugged into my laptop most of the time, but I recently noticed that it's really hard to pull out of other devices so I've tied a phone charm on it which makes that much easier to handle. I had one featuring Nisa that came with a video game (Disgaea 4, I think) still sitting unused in its original packaging. Usability has greatly improved.