On Instructables I found a very nice project of a storage/carrying case of a quadcopter.
It also have the DFX file available, but I the dimensions depend on size of your copter, so might have to be adapted to fit the jDrone or the 3D copter.
Another carrying case I remember is the ArduPirates coffin: probably a safer way to bring the copter around, all wrapped and safe in all that foam, even if a bit less nicely crafted.
Has anyone else built custom cases for bringing their quad around?

Comments
Here's my Coffin inspired quad box.
Fits a jDrones quad with props on (usually throw in a couple of spares just in case!).
Just some hardboard and instrument foam but keeps it all from knocking about in the back of the car. P
Very pretty box!
Now if it could transform into a field platform for holding gear, batteries, PCs, antennas for FPV... where's Ben Heck when you need him?