I packed everything in a light rolling 21" carry on with even some room to spare - thanks everyone. I was surprised but I think it will turn into checked luggage.
It is heavy (about 28 lbs.) and I'm not sure I want to attempt to lift it into the upper bins in the plane. I have a back that likes to act up once in awhile, especially if I do some awkward twisting. I will be alone on the way out so no one will be able to assist me.
I don't want to go without wheels on a 4 hour lay over so using a duffel is not an option. Oh well - at least it is a small piece and I can carry it up and down stairs... just not over my head.