The most popular form I've seen is bottles. Cartons do exist, often in more 'specialist' types of milk, such as flavoured, soy or lactose free varieties.
I went to Switzerland with Mr. Carny two years ago, and while I didn't really enter any supermarkets, the milk at home was UHT (ultra heat treated) milk, which apparently is much more common than the standard. It was in a carton, too.






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