Parcel size to Australia, what's the rate?

Odette, you should use China Post's boxes if you send your parcel via China Post. The biggest box they provide is 53*43*37(cm). Also they require that each parcel should be less than or equal to 20 kg. According to what I know, China Post is the cheapest. But it takes very long time and it's possible that your parcel gets lost. Other international courier companies are more expensive.