We recently acquired a prom dress from 1966 from the original owner complete with the original dry cleaning bag. Normally I throw those bags away without too much consideration, however this bag, although flimsy, had interesting graphics and a warning attached “Warning! To avoid Danger of suffocation keep away from babies and children. Do not use in Cribs, Beds, Carriages or Play Pens. This Bag is Not a Toy.”
I am reminded of an episode from Mad Men that shows Sally playing ‘spaceman’, while wearing a dry cleaning bag over her head. I don’t remember being warned of the dangers of playing with dry cleaning bags when I was a kid, although I don’t recall finding them all that interesting. However, this bag proves that by 1966 there were concerns.