Stevenson Warmlite sleeping bag
I bought this Stevenson sleeping bag in 1979. I still use it today when I am winter camping at Joshua Tree or Indian Creek. It is good to minus 20 below. In the early 80’s the inner vapor barrier fabric developed a delamination problem. I sent it back and they fixed it for free. Forty four years later it finally it has a blown out zipper where the thick top connects to the bottom.
There are two zippers on each side, and it is the upper one that blew, and just on one side: the right.
The company is still around and may be able to send me a replacement zipper.