[Schroedingersat]

There's still inertia and favouring of status quo even in that example.

Milk bags have been in use in some places for decades, pack better, are lighter and use less plastic than a bottle lid. Other places do not use them for no particular reason.

[ZeroGravitas]

I'm not promising immediate perfection, just economic incentives that point in that direction, rather than 180° opppsite.