I think it is one litre per person,spirits that is.it would also serve you to check out the liquid laws at Hong Kong airport as regards to carrying them onto the plane.
Some countrys let you take liquids on as cabin baggage so long as they are purchased in the departure lounge other countries won't let you take any more than 100ml containers irrespective of where they are purchased.It's a ggot to do with the new security regulations.
cheers laurs