After traveling in Japan, I have a lot of luggage. Is there an extra charge for the return flight?

For domestic flights, the number of free luggage per passenger (including checked luggage and hand luggage):

20 kilograms for economy class passengers, 30 kilograms for business class passengers and 40 kilograms for first class passengers. The total weight of each passenger's hand luggage is limited to 5 kg, and the volume of each piece shall not exceed 20×40×55 cm;

On international flights, the total weight of hand luggage is limited to 7 kg (some airlines have special weight restrictions), and the volume of each piece of luggage shall not exceed 20×40×55 cm (the sum of three sides shall not exceed 1 15 cm).

Those exceeding the above weight or volume limit shall be checked as checked baggage.