My money is on plastics. This generation is exactly the one that saw a huge shift happen. Glass bottles to plastic bottles, cardboard takeout containers to plastic containers, metal plumbing to plastic plumbing. You literally go to the store and buy vegetables and they come wrapped in plastic. Even frozen vegetables used to come in boxes. Now? Plastic. Milk carton? How about milk plastic? It's literally everything. Everything is plastic, and it all started kicking off for Gen X.