For many items, bottles. I was quite young before plastics became impossible to avoid, so I remember how things were. As for other things, maybe aluminum for say phone and laptop cases and other items for autos. I doubt we can eliminate all plastic, but I think we can eliminate most of it.

Yes, things would be more expensive, but we have a choice, Health or Plastic. If you factor in the cost of healthcare, then the extra expense may be a wash. It is just a matter of who pays.