Ya know Mouse,that actually says a lot. I have found more uses for silnylon than any other light weight fabric for outdoor applications. It's super easy to seal, easy to repair/patch, easy to sew (once you learn), truly waterproof, very tough for it's weight, and reasonably priced. "good old silnylon" is right and shall be referred to as "GOS" from this day forward.

The only things it doesn't do well is...
1)breathe...horrible for clothing, except ponchos.
2)grip....some very slickery stuff, that "GOS".