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Because there isn’t really a good way to package liquids besides plastic. Glass would work but it’s bulky and brittle. Paper and aluminum work but they cost the inside with plastic anyways. This might be the extremely rare thing where it makes sense for consumers to do at our level.

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Glass is completely fine for liquids. It's only relatively recently that plastic became ubiquitous. In my UK childhood (70s/80s) most drinks, milk etc were in glass bottles that were re-used and/or recycled.

It's mostly the desire to save a few pennies per product that drove plastic.

There are several brands in Europe now that sell water in aluminum cans rather than plastic bottles.

Going with this line of thought, who should eat plastic anyway? Nobody. So how does it make any sense to ever use plastic? I don't understand.

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