Let's confuse Americans!

Head East, I grew on bag milk

Strange. Literally every grocery store in Ontario for decades including many convenience stores sell bagged milk.

It's Ontario.

Quebec here, 4L in 3 bags. Always has been... Honestly didn't know it wasn't common elsewhere in Canada. TIL

Albertan here. When I was a kid my grandma always had bagged milk, but it got phased out in the 90s and I haven’t seen it in forever.

I've only ever seen bagged milk once, somewhere in Ukraine many years ago

I saw it quite often when I lived in Quebec but only for 3L or bigger containers

Where did you live in Ontario? I've never seen anything but bagged milk here.