Hello MButton welcome to the
vape world. I recently traveled to Hawaii from California for spring break and brought my ego-c twist with me. I packed it in a carry case without the
tank attached, but liquid inside of it and stuck it in my carry-on backpack. I flew out of the San Jose Airport if that matters. As far as leaking, I think you should be okay. I also had a 10ml bottle in that same carry case without any leakage. Good luck with your trip & safe travels.