Citizens of the U.S.A., I have returned from that land of 3 million people and 10 million cows to tell you that there is another way. The non-resealable plastic bag: it causes less waste than cartons. Also: it is a form of behavioral control to get you to drink the milk really fast so it does not go bad. When you are full of milk and don't want any more, you seat the bag gently in this little plastic pitcher that is in the back of your cabinet (your landlord may have forgotten to mention this to you). The little plastic pitcher has a flat bottom and can go in the fridge.
And yet. I started to think about the brave tale of our U.S.A. milk cartons. Enter: History!