Excess baggage is any luggage that exceeds the weight or dimension limits set by an airline for a specific flight. The excess baggage limit will vary depending on the airline you're flying with, your destination and the type of fare you have bought. Excess baggage refers to:
Overweight Baggage
This is when your checked bag weighs more than the maximum weight allowed per bag. For example, if the limit for one checked bag is 23kg (50 lbs) and your bag weighs 25kg, the extra 2kg will be considered excess baggage.
Oversize Baggage
This is when your bag is larger than the maximum dimensions set by the airline. It could be that your bag is too long, too wide or too tall.
Too Many Bags
If you bring more checked bags than the allowed number stated on your ticket, the additional bags will be considered excess baggage.
If your baggage falls under any of these categories, you will have to pay airline baggage fees. These will vary depending on the airline, route and type of fare you have purchased.