You can take an unopened can of Coke on a plane in 2026, but only in your checked luggage. Under the standard TSA 3-1-1 liquids rule, any liquid container in a carry-on bag must be 3.4 ounces (100ml) or less. Since a standard can of Coke is 12 ounces (355ml), it will be confiscated at the security checkpoint if found in your hand luggage. If you pack it in your checked bag, there are no quantity limits for non-alcoholic beverages. However, be aware that the change in cabin pressure and rough baggage handling can occasionally cause cans to leak or burst; it is highly recommended to wrap the can in a sealed plastic Ziploc bag and cushion it within your clothing to prevent a sticky mess in your suitcase. If you really want a Coke for the flight, your best bet is to pass through security first and then purchase a can or bottle from a terminal newsstand or vending machine; once you are past the checkpoint, you can carry any size beverage onto the aircraft.