I donate to a friend of mine, but I also have a friend that lives in Arizona, I'm in CA; one of his baby girls if having serious issues with formula, she's on her 3rd type in 4 weeks, but her twin sister is doing fine. I'm willing to ship as much bm as I can to them to see if it would help her, but I don't know how to package it, or how to ship it.
You'll need a foam container (not a regular cooler, foam keeps the cold longer) and as many ice packs as you can get. Put the milk in between the ice packs, then cover the whole container in aluminum foil and, (if possible) put it inside a regular cooler, send it FedEx next day delivery. I've done it before from TX to AZ and it made it fine. Do not send a lot of milk on the first try. You're a very good friend! Good luck!!
Dry ice would be best for shipping..foam cooler inside a cardboard box, overnight shipping..do not let the dry ice touch the milk. Fill the space int he cooler with newspapers or whatever because space equal "melting" dry ice