When I visited my girlfriend in Germany, all supermarkets had these cartons. They came in different varieties (eg, skim, whole, etc), and were about 1/2 litre, as I recall. What I loved was that they were designed to be kept unrefrigerated, on any shelf till opened, and would keep (unopened) for several months. Perfect for a cook who limits his use of milk, but does have an occasional call for it. I've hunted in a dozen mainstream markets, as well as at Surfas and Sur La Table. No luck.
Anyone seen this product out there? My other option would be to put different types of milk into ice trays, and make a bunch of cubes, which I could bag and freeze for later use. That's my fall-back position, and I'd love to be able to find these small 'boxes that are used in Germany and elsewhere in Europe. (Note: I have seen these cartons for *soy* milk at 99 Ranch Markets, but not for regular cow's milk, which is what I want/need.)