We had them when I lived surrounded by Peru, and they keep milk fresh for much longer than the plastic milk jug. Of all places, wouldn't you meditate the U.S. would have them?
Answers:
There does indeed appear to be a presence of the Tetra-Pak for dairy produce surrounded by the USA, but for a limited number of dairies.
Tetra-Pak quote ESE Dairies and Horizon Organic on their prescribed US site.