Hi , what is the max wgt for jakarta-hangzhou ? and how much for addiotal wgt / kg in RP ?

different airlines companies have different regulation on weight limit.
the cheapest tickets are provided by Air Aisa, which only allows a carry-on luggage of no more than 15 pounds (7 kg) and the suitcase can be put into the luggage rack above seats. Each passenger can also take a handbag.
As for checked baggage, it is Rp 630,000 if check the baggage at the airport counter, but it will be much cheaper if you book online with the official site of Air Asia.