I used to travel 2-3 weeks a month in my old position, this thing was a life saver:
It holds about 7 shirts nicely (they make bigger ones), comes with a Folding board with instructions so you fold it the right size, and the shirts stay wrinkle free. It takes about 15 seconds to fold a shirt. It is expensive ($22) but worth it!
Eagle Creek Link
You can find them at the container store, luggage stores, etc. I cannot recommend them enough. I turned 3 friends on to them and they loved them also.