Hi,
When I was pumping I brought the hand held Avent Isis with me and pumped in the airport bathroom as well as the bathroom on the airplane,,,you can't do both breasts at once, but it is an extremely effective hand pump...and you can throw it in your carry on or even a large purse...you can also use the battery adaptor for the PIS...I did that once in a bathroom in a hospital when my mom had surgery...I found it to only last for about 2 pumpings and the suction was a little weaker...have a great trip! Cathy