Ounces to Grams.
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Strength ratings are determined by liability as much as anything else - manufacturers often grossly underestimate the strength of their products b/c they know someone is gonna push the limits. For example, my HH BULA is rated to 200 lbs...but I've had ~250 in it overnight before and never noticed any difference.
Engineering-wise, it would be the weakest link in the system...which varies by model based on materials.
But in the end, I wonder how many manufacturers actually test for their strength ratings. More like sticking a wet finger in the wind, I bet.
I use 1.9 oz ripstop for mine. I have a couple from 1.1 oz but the kind I had was too stretchy.
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IMPOSSIBLE JUST TAKES LONGER