We're going away for 7.5 weeks over Christmas and we have a pretty good supply of BM in the freezer that will be either past or close to its expiry date by the time we return from our holiday. I want to bring most of it with us, mainly so it doesn't go to waste, but also because it would be nice to have a supply of pumped milk available for the occasional feed whilst we're gone.

We're flying from Australia to England first, which is going to be a 33 hr journey when layovers and airport transit times are taken into account. I just don't know if I can keep milk frozen that long. I'm considering dry ice, but need special permission from the airline, aside from the fact that you can only bring 5.5 lbs of dry ice on a plane and that apparently only lasts for 24 hrs.

Anyone have any suggestions? Has anyone ever kept BM frozen for that long of a time? If you've taken frozen milk on a plane, how did you do it - checked baggage or carry on; dry ice, gel packs, or regular ice; what kind of a container did you use?

Any and all advice is welcome! Thanks!

ETA: Bugger, this probably should have gone in travel rather than breastfeeding. Sorry!