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If you buy four litres of milk in the bagged form in Ontario, it costs only slightly more than two litres of milk stored in the traditional cardboard containers. Why?
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Why does Nova Scotian skim milk (perhaps all of the Atlantic provinces have their skim milk this way; I’m only familiar with the N.S. kind) have a bluish tint to it, while Ontario skim milk does not? I only started drinking skim once I moved to Ont., since the N.S. variety creeped me out a little bit. Maybe it’s supposed to evoke thoughts of the Bluenose; I dunno.
NoGoodNamesLeft brought the first question question to mind in the Canadians: Enlighted this American thread; the other one came up while I was typing the first one…
One year my school had switched to selling milk in individual bags to save money. The bags are cheaper not only to manufacture but also to package and ship. You could fit a lot more units per box too. At least that’s what the school said. No one liked them though. Too flimsy.
Not sure on your second question. I don’t drink skim milk nor have I ever seen blue milk (ewww). It couldn’t have been a processing fault or else your government food agency would have never allowed it to be sold. My best guess would be a advertising gimmick to get attention. So, what color are the bananas up there? 
Blue milk might just be weak (dilute) milk. Adding water to milk gives it a blue tinge, but only if the suspended particles are small enough. Incense smoke can either look blue or white for the same reason: particles smaller than the wavelength of light will scatter the shorter bluish wavelengths while passing the reddish ones.
Shine a flashlight through a thin layer of blue milk and the white flashlight will look yellowish or orange. It’s blue was knocked to the side.