My mother has hers from the 70s. It still gets used as a gym lock. I also have mine from somewhere around 1999.

I had forgotten about the "situpon" as it was called in my girl guides camping kit list. I have a folding one from girl guides that was waterproof on one side and fabric on the other to double as a
camp pillow. It also manages to fit in a square cushion cover so now it has a second life as a couch cushion, 20 years later.

There isn't room in my apartment for any more books. I also tend to prefer using an ereader app these days so I try not to buy books at all. Of course, I occasionally get drawn in, but would prefer not to have physical media from both an environmental and space perspective.

My parents have this but it broke 20 years ago. It's a glorified storage space now.