I remained dry as well, 12x12 tarp and Dutch clips saved me.
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All you need to do is put a picture of Dutch there and the water will go back up the whoopie sling and the water will never come near you:D!
cotton is rotten... and therefore wonderful for acting as a rain stop. this is the one piece of gear i have that contains even a trace of cotton.
Like many have already mentioned (including the OP), I simply sling my whoopie ends back over themselves and it has worked fine thus far. If I were worried that wasn't enough I would tie a small length of paracord before the looped whoopie ends--I always seem to have a bit of that stuff floating around anyhow :).