You might consider sheathing ends you are going to knot. I believe it suffers from the same problems as other synthetics do, where knots create a weak point that needs to be reinforced. There's some internet info related. Search on kite string stuff.

I'm still a big proponent of Dacron fishing line. I keep yards and yards of 120 lb test wrapped on tongue depressors between a spooling of duct tape on one end and electrical tape on the other. I have one of these in each of my bags. 100 feet doesn't take up much space.