Generally I hate most third-party stuff, but this little $8 Wal-mart case has proven itself in the past half a year or so I've owned my DS. Holds 8 DS cards, I have my power adaptor in the back pouch, along with some LCD screen wipes, a full-sized stylus/pen, and room left to shove about three GBA games back there. I was even able to find one to match my incredibly rare blue DS. It get chucked around and inside a backpack on a daily basis and has kept the system in good shape, it can even hold an SP instead of the DS. Probably the best thing is that the case isn't much bigger than the DS itself.