The maximum dimensions for a carry-on bag are 9 inches x 14 inches x 22 inches (22 cm x 35 cm x 56 cm), including handles and wheels.
The maximum dimensions for your personal item, such as a shoulder bag, backpack, laptop bag or other small item, are 9 inches x 10 inches x 17 inches (22 cm x 25 cm x 43 cm).
To determine if a bag will fit onboard, bag sizers will be available in the airport lobby. Once at the gate, any item in excess of the carry-on baggage size or allowance requirements will be checked to your final destination and may be subject to applicable service charges.
Carry-on items that are acceptable to transport in the cabin but are fragile or bulky will be considered cabin-seat baggage. Customers can purchase a ticket for a cabin-seat baggage item so that it may be carried on board and transported in a seat.
The following items are allowed and do not count toward your one bag and one personal item limit:
Musical instruments as carry-on
As part of the allowance of one carry-on plus one personal item, a passenger may carry a violin, guitar or other small musical instrument onboard the aircraft as carry-on baggage if:
Musical instruments transported onboard United and United Express aircraft must be in hard-shell cases.
The Transportation Security Administration (TSA) allows each traveler to carry on liquids, gels and aerosols in containers of 3.4 ounces (100 mL) or less, inside a single quart-size (liter-size) clear, sealable bag.