A stop at a local farm supply store will get you a spool of binder twine this is the rope that holds. Hay and straw bales together strong and strudy resits rot this has many useful uses braided together it makes a nice rope. The uses are endless and its easy to buy at a decent price
sisal rope in the UK is the best, the modern plastic rope we see everywhere these days stretches too much.
Im old school the new modern stuff most of the time is junk i have hemp rope here that is 100 years old and good as day it was made
yes, each time I see "sash cord" in a sale I get several lengths of it. I now have a large bag full of the stuff.