United Airlines allows two checked bags per passenger up to 50 pounds with maximum exterior dimensions of 62 inches under the standard baggage fees. Additional bags or luggage exceeding the size and weight limits incur extra fees.
The maximum weight for baggage on United Airlines is 100 pounds. Bags between 51 and 100 pounds are typically charged an overweight fee. The overall exterior dimensions are calculated by adding the length, width and height of the bag, including any handles and wheels. The maximum size for a checked bag is 115 inches, with bags between 63 and 155 inches costing more with the oversized baggage fee.