The peculiarity of this storage box is just that you can keep both DS-modules as well as modules in 3DS. The mounts for the individual modules are mounted so clever that both DS and 3DS modules hold without wobbling and can not fall out.
With 24 free places this Game Case is also very well stocked and should last as long as you only now begins to to purchase a selection of games. Plus, there's an SD card holder, which is probably intended first and foremost for storing an SD card, which is full by downloading games etc.
All in all, a very sturdy box, very well made, lots of storage space and no shortcoming's - highly recommended!