As for tetra-brik, what you have in the US is containers that look like tetra-brik on the outside, but actually lack the properties of tetra-brik. One of those properties is that the product does not need refrigeration until it’s opened for the first time (similar to canning). This allows supermarkets to have a greater stock of milk or juices since they can be stored anywhere, and cut costs of refrigeration. And because the packaging used in the US isn’t tetra-brik, US supermarkets always need have the milk refrigerated, for example, while supermarkets elsewhere don’t need to because the milk is actually packaged in tetra-brik.