” and little kids are really bad with gallon cardboard milk packages.”
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I only recall 1/2 gallon cardboard milk containers-—and I opened them,not my little kids.
A little child couldn’t open a new plastic container of milk either.
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The gallon containers in CT usually had an integrated plastic handle in the top, but they were still unwieldy.
You are right about real little kids, I am thinking of not quite so little kids. My ten year old can now handle the plastic jugs, but wouldn’t have a chance with the one gallon cardboard ones. The half gallon version cost more per ounce.
One quart waxed cardboard milk containers, with the re-closable flip top opening. We used to save them to make fire starters for the coal furnace or on BSA hikes. ;)