I believe that’s called recycling
I live in Canada we put our milk in bags blue and clear.
I too have rocks in my head and bottles on the brain buddy, doesn't make us bad people.What is it with this very common element that has us all so mesmerized ? I’ve got a double dose of it because I collect Quartz specimens of different varieties from rare localities in the Southeastern United States as well. I really enjoy my rocks and bottles !