I would think the milk would be fine in a cooler with freezer packs.
When I worked at a hospital milk bank, we shipped frozen milk in coolers  
packed with newspaper which is a wonderful insulating material. The frozen milk,  
nested together in the center of crumbled newspaper inside a cooler stayed  
frozen for overnight shipping.
Due to a latex allergy, I cannot eat in most restaurants, so when I travel,  
I take frozen entrees to heat in the hotel microwave, and transport those in a 
 cooler with ice packs. They can stay frozen in the cooler for up to 3  days.
 
Barbara Whitehead, BS, IBCLC, RLC
eastern NC

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