The biggest factor that I found was the amount of strap coming off the tree. That is to say, if you are hooking into the loop right at the tree, say 4", there isn't much of the strap to stretch.
However, if you are coming off the end of the last loop and have 4' coming off the tree, then you will have a lot of stretch.
I switched over to whoopies and now I only have the stretch from the hammock material. If you want a strap that won't stretch, get a poly strap. Arrowhead could make you straps with the loops sewn in, like the Slapstraps. Or, in theory (as they are not out yet), the Kammock Python straps would have a multiple attachment length points on a poly line. (Poly line is like seatbelt material - almost no stretch).
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