Yep, never thought about it. Kinda negligent really since we're surrounded by plastic bottles and containers all of the time. (I am concerned about micro-plastics these days.) I remember watching Mr. Rogers on PBS he would run videos of how common things were made (factory footage). Totally fascinat...
Long trips like that are one of those things that feel good when they're done! They also make you appreciate home (and my own bed and pillow especially!).