Pat,
Any size that I can fit on a carry-on but I would check or ship one if the price was right. I am stuck flying in/out of towngas cost too much to drive ~2800 miles (and flying took 6 days of driving out of play). I am getting all my stuff together tomorrow, power meter, safety glasses for lasers and glass torches (I have to teach lessons later in the week). I am not sure if I can fit a crystalaser but they are sweet, I might bring the dead head just to show off its whole 25mW output optics...
-Adam