Anything over your free baggage allowance of two bags is regarded as excess baggage, according to Southwest baggage fees policy. Your excess baggage must not, however, exceed 62 inches (157.4 cm) in length and 50 pounds (23 kg) in weight in total. Southwest Airlines imposes a USD 75 excess baggage tax for each additional bag you bring. Any luggage weighing between 50 and 100 pounds must pay an overweight baggage tax of USD 75 per bag, per way, according to Southwest Airlines (24 – 46 kg). For every bag measuring between 62 and 80 inches, Southwest Airlines charges a tax of USD 75 per bag, per way (157.4 to 203.2cm). Read More - https://www.travomonk.com/baggage-policy/southwest-airlines-baggage-policy/