The packaging of milk is dependent on the processing plants. In Alberta, the demand for bagged milk doesn’t exist, so the plants in Alberta chose to package their milk in cartons or jugs. It’s the same great, high quality milk, just in a different container!
You can visit the Alberta Dairy Council, the non-profit organization that represents processors in Alberta, for more information.
But don’t forget that no matter how that milk is packaged across Canada, it all must meet the same safety standards before it hits the shelves.