This is Alex Peter. Travelers may check in one bag for free for certain fare classes according to United Airlines Baggage Policy additional bags will result in fees. Must fit in the overhead bin or behind the seat for carry on luggage. Since weight and size limitations can occasionally vary, it's a good idea to check the most recent regulations on their website. Remember that anything that is fragile or valuable should be packed with care. Customer service is accessible for any questions or specific needs, ensuring a flawless travel experience.