Tnere are fabrics that are thousands of years old. Admittedly they are not asked to carry weight any longer but still and all. Nylon or polyester are synthetics and so are not subject to the deterioration found in natural fibers. While they do have a shelf life it is estimated they take a while to decompose.
http://www.renfrew.edu.on.ca/curricu...estmeath/A.htmNylon Cloth...............30-40 years
So if you keep it dry and out of the UV spectrum you should be good for a few years anyway. Even moisture will not "rot" the fabric like it does cotton or wool. But it will make it musty.
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