United Airlines allows each traveler one carry-on bag with maximum allowable dimensions of 9 inches by 14 inches by 22 inches. Each traveler also may have one personal item, such as a shoulder bag or backpack, with maximum allowable dimensions of 9 inches by 10 inches by 17 inches.
The airline includes handles and wheels in the size limitation for carry-on bags. Bag sizers are available in airport terminals. United Express flights typically use smaller aircraft with smaller carry-on bins, which may require travelers to check bags even if they meet United's carry-on size requirements. Travelers with large items that are too fragile to transport as checked luggage may purchase a second ticket and take them as cabin-seat baggage.