Hi Gang, I've collected plants from all over the US, and shipped them home as luggage. I just wrap everything up in newspaper and box it up. Usually, to be safe, I double box everything so it doesn't fall apart. If I have a few items I just carry them on, no problem. Carry on items go through the machine just like everything else and seeds, cuttings, and bulbs have done fine for me. I have heard that luggage items get a good does of radiation, but this has not been a problem for plants, even tender tropicals or seeds. Of course, if I have more than an apple box-full of plants I ship them FedEx, DHL, or the Post Office. Cordially, Joe Conroe TX