[joker_minmax]

In Canada families have a pitcher that's the right shape and size for the milk bags that are sold, and is reused. You just snip the corner off the bag. That said, the milk is double bagged (several smaller bags of milk in a larger bag, 1L each maybe?), so there is still a fair bit of plastic involved. The time I was visiting my friend in Canada one of the bags that he brought home busted. Not exactly fun

[timbit42]

The outer bag contains three 1.333 litre pouches of milk for a total of four litres per bag.

You definitely want to check that no milk has leaked from the pouches into the outer bag before purchasing. They are fairly robust though. They can withstand a fair bit of mishandling but sharp objects are their worst enemy.

[joker_minmax]

Username checks out.