So - a quick word to the wise when traveling with your PV's. If you are flying or driving in areas where you have increases in Altitude, I have a trick for you.
Store your tanks upside down

As the altitude increases, so does the pressure. The pressure increase will flood your tanks and push
juice out the bottom. If you do not completely fill your tank, and store it upside down - the pressure increase will not push your
juice out

Just make sure you do a dry pull or two if you have let it sit for a little while. Wanna make sure you get the wicks wet again.
I remembered to do this with my tanks in hand, but I had some prefilled carto tanks that I forgot about - nice sticky mess. My bottles of juice that I took with me experienced the same thing and my carry case was a little messy too. Works the same with shampoos - etc. - I just put those in ziploc bags LOL