Glass bottles had variation, because they had their own deposit/return chain to hang on to their own bottles for reuse. They could afford to use them as unique

Glass bottles had variation, because they had their own deposit/return chain to hang on to their own bottles for reuse. They could afford to use them as unique branding too. If they were getting Pepsi or Irn Bru bottles back, or no bottle back, it wouldn't work. Now, a bottle of Coke is identical to a bottle of Pepsi, Irn Bru or cheapest own label, except for the label, colour of contents and cap. Just a standard, almost generic, 2l or 500ml bottle. Do they even sell glass Cokes any more? I can't remember the last time I saw one. Beer still comes in glass, so there's far more variation. Deposits are no more. Reuse is no more. Can't be that powerful in differentiating or marketing in comparison to saving a penny or two using generic plastic.