I picked up a cheap ratchet strap for $3.50 to try the material as a tree hugger strap. (from the local elcheapo shop)
Injected the end loops etc and the weight for a 6' hugger is only 15 grams.

The material is quite soft but the rating on these "premium" straps is 400 kgs. This is probably worth a grain of salt though....

I have a fear that they are nylon straps ???

Last night I strung one up in the garage from wall to wall nice and taunt, then measured the strap length and hung 40 kgs from the middle of it overnight.
This morning it had stretched out 100mm in about 8 hours and sagged considerably.

Does this mean it's nylon if it did this ???

Or will they just stretch xx amount and then be fine.