Let's say I want to make one set of whoopie slings or UCRs and have some left over in case I'm forced to use trees that are too far apart. How much do I need? It's cheap and I could just get a lot but I'm shipping it overseas and don't want to have much more than I would want to carry with me when I go camping.

I'm going to use 1/8" for suspension. I was thinking of getting some 7/64 for a tarp ridge line. How much would I need there?