@eleanorrees There's a chocolate oat milk brand that has containers similar to these - and other than the plastic lids tending to leak - the main issue is that no matter how much you tip the container upside down theres somehow always half a mouthful left in the container... needing to be cut open.

I could have sworn we had figured out milk cartons already, it kinda feels backwards that we've added a plastic part and made it worse.