I hv posted abt. this before may be in August or Sept 07 but could not find.
Yes, you bring back some chilled milk for short trip. You need to bring the Fridge-to-go and keep them in the freezer of the hotel (ask them to keep for you at a colder fridge). Then you can pump your milk and put them in the hotel's fridge by use to "double milk bags" i.e. one bag inside another (boots milk bag). When you come back to HK. You keep them in fridge-to-go, then wrap the fridge-to-go in layers and write "Breast Milk, Don't open, fragile" clearly on the wrappings and secure them in the 寄倉 luggage. It will come back to HK safely. My exp. was at Shanghai and Chung Qing.