I now have the milk with the new cap at home. But I have to say, I'm not happy with it at all. The cap itself is good, BUT pouring the milk doesn't work at all without sloshing/ sloshing/ bubbling (as you call it) - unless I make an air hole in it myself. Only then the lid is useless. Why isn't it possible to use a cap like the one on budget milk or iced tea? I've never had any problems with slippage there.
Please change this again!!!!!
And now you need a cardboard box for stacking, with a hole for the closure in between, so that the packs can stand on top of each other. How stupid is that? Are people always told to produce as little waste as possible and then that? Somehow strange...