Your overhead luggage's dimensions must be within 45 linear inches, a maximum of 9 inches by 14 inches by 22 inches. United determines a passenger's luggage weight allowance by her seat class, frequent flier membership and military status. Weight allowances range from 44 pounds for economy class travelers to 140 pounds for active-duty servicemen.
United allows passengers to bring three ounces. containers of aerosols, gels and liquids in their carry-on luggage. These items must be stored in a resealable, clear plastic bag no larger than a quart. Some liquid medications or baby formula in larger containers may be brought on board after being declared to a security screener.
United permits passengers to bring purses, laptops and reading material on board in addition to their overhead luggage. The airline also permits mobility assistance devices, such as canes and walkers, along with safety seats for infants and toddlers with some restrictions.
