Bagged Milk?

So, I recently learned about bagged milk. It is seriously a gallon's worth of milk in a bag. My brain can not understand this phenomenon.

I have never, in my entire life, heard of bagged milk. Up until now. My parents act like it’s this totally normal thing. But, I just CAN NOT UNDERSTAND IT! Can y’all explain this to me? Please? Because, my milk has only ever come in plastic jugs or waxed cardboard. NEVER HAVE I EVER HAD A BAGGED DRINK! 

Like, how do they drink it? Keep it? Because, it looks like a gallon of milk, in a bag. But, I don’t drink a gallon of milk on my cereal. (Well, I don’t drink milk anyway. I’m a soy milk person. But, I digress.) How do they keep it? Transport it? Don’t the bags burst? 

I just… And how have Americans NEVER made fun of that? Like, we’ll be all, “Oh, ‘ello, mate! Want to go watch the telly, eat fish ‘n chips, grab a pint, and drink tea? GOD SAVE THE QUEEN!” and "Want some maple syrup, eh? I'm a Mountie, eh. Canadian bacon, eh!" BUT HOW ARE WE OBLIVIOUS TO BAGGED MILK?

And, I'm totally not the only person that feels this way. If you search "bagged milk" on Tumblr, it's completely normal. In other countries. They're actually making fun of Americans for not understanding it. I'm sure we have things that they don't understand. However, some very kind Canadian made a video explaining bagged milk for all Americans. It must be like Harry Potter explaining the function of a rubber duck. Like, it's something that's painfully obvious for them, but insanely fascinating for us. So, thank you, kind Canadian. I owe you my sanity.