DS games cartridge storage

[tiggsybabes]

What do you all keep your games in? I'm amazed that we've never lost any, but am looking at buying something before we do. I got a bit upset a few weeks back when I couldn't find the animal crossing cartridge, as thought my town had gone for good.
EDIT: They are currently kept on a high shelf, either in the boxes or in a small pile (the ons we play regularly & I've yet to misplace one)