The maximum Southwest check in baggage size is 62 inches (157.48 cm) in length, width, and height. If your bags weigh more than this, they might be charged more or they might not get transported. Prior to leaving, it is essential to confirm the precise baggage allowance and restrictions that apply to your route and ticket type.
Website: https://www.travomonk.com/baggage-policy/southwest-airlines-baggage-policy/