Carbonated beverages are allowed in checked bags, but they may explode due to changes in air pressure. Carbonated beverages are not allowed in carry-on luggage because bottles and cans are larger than 3.4 ounces.

You are allowed to bring Coke or any other soda on a flight, but you must adhere to strict security regulations regarding liquids. According to TSA guidelines, you cannot bring containers of liquid larger than 3.4 ounces (100ml) through the security checkpoint in your carry-on luggage. If you have a standard can or bottle of Coke, it must be packed in your checked baggage. However, there is a common workaround: you can purchase a bottle of Coke at a shop or vending machine after you have cleared the security checkpoint, and you are then permitted to bring that beverage onto the plane with you. Alternatively, you can bring an empty reusable bottle through security and fill it with soda from a fountain inside the terminal if one is available. It is also important to remember that most airlines provide complimentary sodas, including Coca-Cola products, during the in-flight service, so you may not even need to bring your own unless you have a specific preference for a flavor or size not offered on board.