Always cardboard boxes for me. Bought 0pastic for quite a while, but in the meantime AI get better quality milk in cardboard for less money than in plastic. And the glass bottles here are just stupid: expensive, single use with deposit. Neither good for the environment, nor for my time resources.
This I would sign instantly! Here we have premium organic good for three days “Frischmilch/Vollmilch” milk in cardboard boxes too.