I bought this case after long consideration as a general purpose hold-all for ALL my portable games. I'd been frustrated many times in the past by the limitations of Gameboy and DS bags/cases, they always seemed either too big, too small or badly laid out but I took a chance on this one and I'm delighted.
It currently holds my DS Lite, Gameboy Advance SP, USB charger, Pokewalker, 13 DS games, 8 GBA games and 8 GBC games (remember how huge those cartridges were?) with room to spare and looks no bigger than when empty. Even better all the DS games are neatly laid out where they are easy to see and get to instead of buried in an awkward back pocket as in so many cases.
The only downside I can see is it might not fit the standard UK charger, but I gave up using that one long ago because it's so big and awkward.
Finally here's the measurements for the case (when empty), in case anyone else considers size important when choosing a case:
22cm high, 21cm wide at the bottom, tapering to 19cm wide at the top, 7cm deep.