Since all we need to carry on board is the headset, most of my colleagues use a standard notebook case, some even smaller cases or no case at all. I use a standard samsonite notebook case currently, but since i often carry some papers i'm working on i do consider getting a bigger one again. Used to carry a standard nav kit back in the days, but thats pretty much used up by now. I was thinking about a Rimowa pilot case, but they are not exactly cheap. Decisions decisions...