No problem! Evivo can withstand a wide range of temperatures through the hottest and coldest seasons and Evivo does not spoil. Even if you accidentally leave Evivo out for an extra day you can still it put it in the freezer and the product is perfectly fine to use.     TSA allows frozen icepacks but no liquid. We suggest using an insulated pack with a frozen ice pack or two for transporting Evivo in your checked luggage or carry on. You could also bring it aboard in a couple of zip lock bags and then request ice from the flight attendant. Keeping the ice in one ziplock and the Evivo in another just in case the ice leaks. This will keep the Evivo cool for the entire length of your flight.