One idea is to put it in a big suitcase, fold it in half with the suit coat hanger still on, and just lightly put it in there, so that nothing is pressing on it on either side. If your suitcase is smaller put one shoulder inside out and into the other shoulder, to help keep their form. Also, for a smaller suitcase you might want to find a box to put it in by itself that can fit inside the suitcase. Something heavy pressing on it is what causes wrinkles and that is what you want to avoid. Just something my old lady taught me haha.