Plastic bottles became common more like 60 years ago. They were invented in the 1950s but were too expensive for a while. I remember as a kid in the 60s there was a commercial where somebody dropped a bottle of shampoo, which normally would have been glass, and was amazed that it didn't break. This stuck in my mind all these years because of a standup comic named Norm Crosby. who told on a talk show about this scene actually happening to him at the grocery store. The lady in front of him dropped her shampoo, so he picked it up and re-enacted the commercial - "It didn't break... It didn't break!!!". He was hoping for a laugh but she just glared at him and said, "Gimme da soap." Anyway, that's how I know plastic bottles were being popularized in the mid-60s.