Never done it but my advice would be to freeze it, then wrap the frozen bags in bubble wrap and put in an esky bag with lots of frozen ice packs. Definatly take on as hand luggage, imagine if you checked it in and something heavy dropped on bag and spilt milk everywhere!
Good luck,


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) and it's worked fine. I have the Medela cooler bag and ice brick (they came with my pumps) and my milk has stayed icy cold for a good 8-12 hours but not frozen. The Medela ice brick is amazing. It comes with the cooler bag and is moulded so four small Medela bottles fit snuggly around it. I'd highly recommend getting one if you can. 



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