Turkish Airlines' carry-on policy allows passengers to bring one bag and one personal item on board, with the size of the carry-on bag not exceeding 55cm x 40cm x 23cm. The personal item must be able to fit under the seat in front of you. Passengers can check-in additional baggage for a fee based on their route and fare type. For more information on Turkish carry-on policy, visit their website. https://www.farecopy.com/baggage/turkish-airlines-baggage-policy