随身： For travel worldwide on United, you may carry on one bag and one personal item such as a purse, briefcase, or laptop computer.
A carry-on bag must fit under your seat or in the overhead bin.
Carry-on bag dimensions should not be more than 9" x 14" x 22" (length + width + height) or 45 linear inches (the length, height and width added together).
United may require that a carry-on item travel as checked baggage if the item cannot be safely stowed on a particular flight.
