I'm happily hanging my 170lbs' in a 1.1oz single layer. I'm hanging in a HH Clone and I've pulled the center out about 1.5" on each side to account for a little stretch after several hours of hanging.
I'm not saying that everyone should go out and try this, but if you are looking for the true ultralight, sometimes pushing the boundary a little is worth it. Here are some pics.
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