Case Logic GBC1 Gamecase
Two compartment case fits hand held in one side and accessories in the other.
Fits either of my GP2X, DS Lite, Dingoo, or Pandora. The case holds the system, charger, and accessories.
It offers basic protection and holds everything.
It has belt loop things so you can wear it like a 'belt bag,' I heard those are coming back in style :unsure:
As for the Pandora I keep the Pandora in one side.
A charger, SD reader, SD card, USB ethernet adapter, short USB A-M/A-F cable, Short USB A/B cable, and a Griffin SmartShare USB Hub in the other side.
I think they are currently out of print but come up on eBay every now-and-then:
I am not affiliated with this product or auction.
http://cgi.ebay.com/Case-Logic-Carry-Case-Nintendo-Gameboy-BRAND-NEW-/270718759553