ask haagen-Dazs to pack it for you. They have dry ice. You should estimate the time of your journey and tell him how much ice you will add in how many hours. It turns out that their ice cream moon cake packaging is said to be dry ice for an hour, but it can also be used for three hours without melting. It is not clear whether you can take it on the plane. You have to consult the airport to know. There should be a Haagen-Dazs store in Urumqi.