My husband and I are taking a belated 5th anniversary trip next month, and we're leaving my son with my parents for one-two nights. My son is 8.5 months old and still nurses 4-5 times a day. We've already checked breast milk with dry ice below a plane, and were completely panicked when our flight was canceled and thought we might lose the 200 ounces we were carrying. Luckily we made it home and the milk was still frozen, but I don't want to deal with that hassle/worry again. Has anyone successfully shipped breast milk with dry ice? Did you use USPS, UPS, Fed Ex, etc.? Any tips?