As a non-canadian: That's I we learned it in school in europe, so I don't think it's weird at all.
Edit: I hope I don't offend some sort of canadian national treasure by saying this but: Bagged milk looks unpractical as hell.
But it's so damn cheap. That's literally the only reason to buy it. It's for college kids (like me) and poor families who can't afford the practicality of a carton of milk. Milk cartons are almost 5 bucks or over 5 bucks in some case (for a 2L carton). It's like 3 and change for the bags and you get like 4 and a half liters. A jug or bottle is unheard of here for some reason.
@mikkaq: I think the new bills look and feel like shit but it does make me think of the fuuture
Why is Canadian milk so expensive? That's like twice as expensive as it is in the UK.