you have to keep in mind, that a double layer hammock isn't even necessairly stronger than a single, if you put a thick air pad between the layers, all your weight goes onto the outer layer, some people use air mats between the layers and some don't, but the rating needs to account for things like that as well.
also, there are alot of varations in 30d ripstop, some are signifigantly stronger than others, but they're all generically referred to as 1.1 ripstop even though the breaking strength will vary
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