According to BPL, Air Core Plus has a breaking strength of 1109 lbs and weighs .036 oz/ft.
It's expensive, but very light. I haven't measured the stretch...there's a little bit but nothing like parachute cord.
FWIW, I stopped using the Air Core 2 as ridgeline - it's strong enough, but it's so thin that it was damaging the supports.
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IMPOSSIBLE JUST TAKES LONGER