Can I carry an empty thermos on a plane?

That Empty Thermos? It's Plane Sailing!

Traveling with an empty thermos shouldn't be a stressful part of your journey. The simple answer is: yes, you can absolutely carry an empty thermos on a plane, both in your carry-on and checked luggage.

Unlike liquids, which have strict volume limits and require transparent containers, an empty thermos presents no security threat. Its lightweight and collapsible nature makes it a convenient travel companion for those who prefer to refill their drinks once they've arrived at their destination. Whether you’re a coffee aficionado looking to maintain your morning ritual, or simply prefer to stay hydrated with your own water, the empty thermos poses no problem for airport security.

The key is the word "empty." A filled thermos containing liquids would be subject to the Transportation Security Administration (TSA) rules regarding liquids, gels, and aerosols. These rules typically limit individual containers to 3.4 ounces (100 milliliters) and require them to fit within a quart-sized, clear, resealable bag. An empty thermos, however, bypasses these restrictions entirely.

So, feel free to pack that empty thermos for your next flight. It’s a handy container for storing purchased beverages, keeping your drinks cool or hot once you reach your destination, or simply acting as a lightweight, reusable bottle. Just be sure it's truly empty before you go through security to avoid any unnecessary delays. Enjoy your trip!