In the UK there is (still, in some places) milk delivery to the doorstep in 1 pint bottles. These are all a standard size, and they're all branded by the dairy. But interestingly the dairies are perfectly happy to use another company's bottles if they end up with them - branding be damned.

When I lived in a place with only one delivering dairy, this was quite rare. In Liverpool, I'd say that 10% of the bottles I get are 'foreign'.

In the US, I quickly accumulate 3-4 Stanpac glass bottles that are almost entirely identical, except for the indelible sintered labeling, and then I get behind on taking the right one to the right store and throw them out.

Which is something that could be solved by regulation mandating standard bottle shapes. Environment is more important than "brand identity".