I don't have a ton of loose HuCards, so I just keep them in one of those hard plastic boxes with a flip top lid that are normally used for stacks of sports/trading cards. The one I'm using isn't filled to the top, but I'm guessing it could hold 15-20. There are taller ones, though, so if I ever had a bunch of loose HuCards, I could easily switch to one that held more yet. I really love these plastic cases for game stuff; I also use them to store loose Game Boy/Game Boy Color games and memory cards.