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Hello Ash,
I have used black ripstop nylon as a scope shroud and it is nice and light and doesn't absorb water. It is not completely light proof though. IMV It's disadvantage for your application is that by my observation, it suffers dimensional change with temperature. That is it appears to expand with lowering temperature. This is OK with shrouds that use elastic shock cord to provide constant tensioning, however in your application, I suspect you will find that you might have to tighten it up during the night as the temperature drops on cold nights. I find I have to do this with my 8" travel scope.
I have also seen a ripstop shroud dump a load of water (dew) on a mirror (20") during pack up operations at the end of a dewy night.
I am now using Lycra due to the above issues. I curently have one on order for my 10" from a local dress maker for about $40.
Cheers,
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