United Airlines has specific size and weight limits for checked and carry-on bags. For carry-on bags, the maximum dimensions are 9 inches x 14 inches x 22 inches (22 cm x 35 cm x 56 cm), including handles and wheels. For checked bags, the maximum dimensions are 62 linear inches (158 cm) (length + width + height) and the maximum weight is 50 pounds (23 kg) for Economy and Premium Plus fares, and 70 pounds (32 kg) for United First, United Business, and United Polaris fares. Excess weight and size will incur additional fees.