China Post sends international parcels to Sao Paulo, Brazil. Can only send small packages, but not big packages? How much is the postage and how long will it take?

How big is the big bag? I used to send books to Brazil in their largest standard carton. I remember that the maximum weight is 20 kilograms, and the small package seems to be half a kilogram.

Found it on the post office official website:

Items with a single weight of less than 500 grams can be charged according to the type of certificate;

If the volume weight of medium-speed express mail is greater than the actual weight, it must be charged according to the volume weight. Volume and weight are calculated per 6000 cubic centimeters 1 kg. The calculation formula of bulk density is: bulk density = (length× width× height) /6000.

You can check the postage directly on the official website of China Post:

/internetPostageAction.do？ reqCode = gotoPostage