binder twine

noun, a course twine used to tie bales of hay, straw, etc. (COD); see also baler twine, baling wire

“If we couldn’t find a bridle, we just made one out of binder twine.”

“We’d put a rope across with binder twine across the back, and then we’d bring sheets, and you’d make curtains.”

“The binder twine was a little thinner than the baling wire.”

“Binder twine, it’s called, wasn’t wire. I think in the old days they used to bind or bale hay with wire.”