u can check the rates here: http://www.pos.com.my/pos/appl/fast_mail_rate.asp

How big is it? if less than 30cm then depend on weight.


If more than 30cm then they will measure the parcel and see if the actual weight or the volumetric is higher. they will choose which ever higher

To find out Volumetric rates :

length x height x width / 6000 = Approximate weight

Once u got the Approximate weight then u can check the rates at the above link