Bellbran said "About 10 years ago I bought a 1l juice jug from Canadian tire. I open the carton, you could cut it off. I then pour the milk into the jug. It is clean and you don’t need to worry if you cut the top of the carton off.
There are both 1l and 2l juice jugs.
I hope this helps someone. "
most people have solved the carton issues by doing this. It works well. Simple solution.