If the oats in your "milk" are not organically raised or certified glyphosate free (Detox Project; not GMO verified free, [there are no GMO oats]) there's a high probability glyphosate ( active ingredient in Roundup), was used as a desiccant at the end of the growing season if grown in the Northern Plains in USA or Canada, and the oat seed soaks it up like a sponge. A few years ago General Mills Cheerios had 1200 parts per million glyphosate the FDA's actionable level was set at an arbitrary 400 parts per million. Not to mention that glyphosate destroys the living soil's microbiome and your microbiome just as well.
Need Vitamin D? Go out in the sun or get it from one of Natures best sources: grass fed butter fat, from cows that eat what they were evolved to eat, not grains, that's the way to get the real Vit D.
By a recyclable carton, I assume you mean paper board, it is still coated with plastic inside and maybe outside, very few if any waxed cartons exist which are not recyclable.
How about sourcing locally from a small regional fully grass-fed dairy packing in reusable glass bottles ( with 500 cycles? each bottle). Not "milk" from ingredients shipped halfway around the world or from 400 to 1000 cow feedlot CAFOs even if it's " certified organic"
Just a little more to add to the mix of what to think about when discussing sustainability.

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