Some dry ice and fedex ought to do it

I buy my raw milk from an Amish guy who is not close by and sometimes he ships if I'm the only one picking up. He puts foam insulation on the bottom, sides and tops. He packs ice packs (he just freezes water in plastic bags) and overnights it to me. I've never had an issue. I've bought milk, cream, and cheese this way.

That's what I do for frozen, isn't that over kill for refrigeration

Lit, I appreciate it. I will ship some to my mama on the other side of the state to see how it fares.

He's adds butcher paper to the open space as well to close the gaps.

I think it would depend on the temp difference. A hot summer day in the back of a delivery truck is brutal. My Shari's berries (chocolate covered strawberries) did not survive with just cold packs in May in TX. Cold packs for nearby-ish and dry ice for warmer/longer trips.

I have received packages of frozen meat and yogurt from Pennsylvania.... Shipped to FL via UPS 2nd day air. The cardboard boxes are lined with a paper based liner about 3" thick; then they include dry ice in summer months (regular ice packs in cooler months)... They also have delivery texts and let you know when the product is arriving/has been delivered. This is crucial in the summer in the tropics.... Things melt quickly.