"How would you even get the milk out of the bag? And how does the milk even get into the bag in the first place? A carton or a plastic jug makes sense, but a bag is floppy, awkward, and has no way to get into it unless you cut it. Well, if you've ever visited the eastern parts of Canada, you have likely seen bagged milk everywhere. It's available in Ontario, Quebec, and most of the Maritime provinces."
"Canada, unlike the United States, relies on the metric system. Those bags of milk are 4 liters, which is slightly over a gallon. Canada only adopted the metric system in the 1970s. Prior to that, milk was sold in glass bottles and milk jugs measured in pints and quarts. Converting to metric meant a logistical problem for all the factories that had been set up for imperial measurements."
"If you haven't experienced a bag of milk, it might be hard to imagine - a literal bag of liquid (the formal industry term is "pillow pouch"). The individual 1-quart bags are very jiggly. Canadians typically place each of those smaller bags in a reusable pitcher. The bag, shaped like a long sleeve, is snugly supported so it doesn't slip or spill. The top corner of the bag is cut to allow for pouring. All milk,"
Bagged milk is common in eastern Canada, sold as 4-liter outer packages containing three 1.33-liter inner bags. The metric conversion in the 1970s made converting one-quart bottles into 1.33-liter bags an economical choice for factories, so producers adopted bagged packaging rather than modifying existing bottles and jugs. Consumers place individual bags into reusable pitchers and cut a top corner to pour. Bagged milk packaging produces only about 20% to 40% of the greenhouse gases compared to jugs and cartons, and rinsed milk bags are recyclable.
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