There is one type of milk jug (no not that type), that is much heavier plastic and is opaque white. It has a very secure screw on lid that does not leak. It is for a special processed milk called Lactaid. It's used by all us poor unfortunates that are lactose intolerant...
I have used these jugs for fuel with no problems.
The only issue is that they do not hold a gallon, only 3 quarts. I guess that's to convince we poor misfits that we're getting a deal when we're actually paying 1/3 more for the milk.
Without it I could not have milk on my cereal...

Giving up Ice Cream was the biggest loss...until I discovered one company does make lactose free ice cream...vanilla only though.
Getting old SUCKS! Yeah I know it's better than the alternative...but sometimes I question that!
Randy Cuberly