I have traveled abroad extensively with no problems taking my REO's. I put my juice in small bottles in a ziploc, don't leave any in your mods as the pressure changes will cause leaks, I know cuz it happened to me my fist time. Put the batteries in a case, and keep these in your carry on, they are forbidden in checked baggage. If you are bringing scissors and other tools for rebuilding and such, put them in your checked bag, or they might get tossed going through security. Going to asia is a loooong flight, so I usually buy a pack of high nic blu cartos and run them on a small vv ego battery and stealth vape on the plane and in the airports. As long you take short drags and hold in longer than normal, there's not much, if any, visible vapor to bother anyone. Have a good trip!