I have one left from about 1976, until a month ago, I had two from that era. I gave one away because I was buying a new one and needed room.

I last used one of these in 2005 on a four day trip and it was fine. They were always stored flat and without the nozzle being closed... self inflated and open.

I had three from that era, and I can't find the third one.

Since then, I have purchased 3 newer models, including the NeoAir.