“Consumption of milk per capita has gone down every year over the last 30 years,” says Sylvain Charlebois, director of the Agri-Food Analytics Lab at Dalhousie University. “Actually, it’s gone down by more than 20 per cent since 2015.”
While bagged milk is often cited as a unique Canadianism, it’s actually not sold west of Ontario. Those who prefer it, however, say it’s more cost efficient and some even believe it tastes better.
I would say that it’s currently unverified and potentially bunk. Have updated the comment to note this and will do so again if I’m not able to find supporting (non-opinion) academic papers. Thank you for asking for evidence and making me reexamine something that I “know”.