Traveling while pumping

My baby will be 7 months old next month, and I will be going away without him for 3 nights and 2.5 days. I left for 1 night and 2 days a couple of months ago and was able to pump and bring my milk through the airport still cold just fine, but this is twice as long of a trip. Does anyone have any suggestions about traveling while pumping for a longer period of time? I’ll be flying again this time and really don’t know how I’ll be able to keep that much milk cold for that long and in what type of storage.

Thanks in advance!!