Dana Designs Arcflex Terraplane backpack purchased in 1994 at Teton Mountaineering in Jackson Wyoming for $400. I've since used it to travel the world and apart from having had to replace its foam back-liner and a buckle, it is still perfectly sound in every way.
Dana Designs doesn't exist anymore, but the guy and organization behind them is still alive and well and making handmade backpacks in Bozeman Montana under the name "Mystery Ranch."
You can get a Mystery Ranch Arcflex Terraplane that's basically the same thing as the original Dana Arcflex, only made with newer, better materials and technology.
This is a phony bullshit talking point. The possibility of a cooling climate was briefly raised and entertained in mainstream media for about a year in the 1970s. It was never even remotely a scientific consensus view. Contrast that with human caused warming which has been settled science for decades. There is no comparison. As I said, it's a bullshit talking point.