I'm mom to a 4yr old girl(allergies, asthma, CF?)W/lots of nebs. We too travel, and really like the Pari Trek S....w/battery pack and car adapter. She likes it because it's small and easy to carry, so she feels good knowing that she is helping out. But, make sure that the Trek S can handle her meds that she is prescribed (Good tip from AnD)this is something that must be considered, esp if its her primary unit.