If you're planning to bring EBM on board then they will all need to be packed in 100ml (find 100ml bottles or storage bags). Put it in a good cooler bag (eg fridge to go) with ice packs that can last the whole trip. On the way back, will your milk be frozen? If so, you can put it in cooler box with ice packs (or dry ice) and check it all in. To retain temperature, best to have a few ice packs. You can put the milkbags in zip lock and rewrap with newspaper to retain the coldness too.
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