It's a Canadian institution. Or at least, a piece of Canadian culture. OK, fine, it's an interesting quirk that visitors to Eastern and Atlantic Canada are often flummoxed by, but residents have lived with all their lives. Until, perhaps, one day soon when bags of milk may vanish from grocery stores.

That's the speculation, at least, as milk consumption declines. But it offers a chance to take a little dive into the world's most interesting form of dairy delivery and see ... why? How? And for how long?

GUEST: Andy Takagi, dc98-11ee-b04f-07ab704a4184.html">reporter, The Toronto Star

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