I travel overseas frequently using my 22" Tumi roller, at times upto 2 weeks at a time. Best thing that's happened to me is getting a Tumi packing folder which also comes with a small board within that shows you how to fold shirts as well as keeps them "almost" wrinkle free (still have to use to iron however my shirts/pants arent too messed up. I have two of these and fits well in my Tumi 22".
cheers.