You can bring Thermos in your carry-on bag, but certain conditions apply. It is also allowed in checked baggage without restrictions. Thermos is allowed with conditions in carry-on bags — Must be empty when going through security; can be filled after the checkpoint. Thermos is allowed in checked baggage — Allowed in checked bags; may contain liquids. A thermos or insulated bottle is allowed through TSA security as long as it is empty. Like any container, it cannot hold liquids above 3.4 ounces when passing through the checkpoint. Once past security, you can fill it at water fountains, restaurants, or coffee shops in the terminal. TSA officers have the final say on what is allowed through the checkpoint. If you are unsure, check the TSA website or ask an officer at the airport.
Thermos is allowed in carry-on bags with conditions. Must be empty when going through security; can be filled after the checkpoint. Make sure to comply with all requirements before arriving at the checkpoint.
Yes, Thermos is allowed in checked baggage. Allowed in checked bags; may contain liquids. Pack it securely to prevent damage.
Thermos is generally permitted, but a TSA officer may inspect it further. You might be asked to remove it from your bag for separate screening.
TSA rules apply at U.S. airports regardless of destination. However, your arrival country may have different import regulations for Thermos. Check the customs rules of your destination before packing.