Despite all the warnings to the contrary, don't be afraid to just pack it in your duffel bag. When my dad and I are traveling with our respective devices, we just leave the humidifier at home and bring the unit, tubing, etc. That will fit nicely in a small duffel bag or suitcase. As long as you don't check it and don't drop the bag, you'll be fine. Not really worth carrying it around in its carrying case and dealing with one more bag, IMHO.