In some parts of Canada, milk is bought in bags. 3 bags are packaged in 1 bag totalling 4L(~1gallon). A plastic jug holds the bag while the corner is cut to pour
This stubby bag of milk. (Yes, in Canada we buy our milk in bags) : r/mildlyinteresting
Why Does Canada Have Bagged Milk? Where Are the Cartons?
This is how bagged milk came to Canada and why it might be here forever
Is it true that you buy milk in bags in Canada? - Quora
Here's why milk comes in bags in parts of Canada | CBC Radio