I have been using a spool of the Freshops coconut-fiber twine that I got with my rhizomes about 6 years ago (unfortunately, only my Cascades survived the first Winter)... that stuff is extremely sturdy and durable, I'm still using the original spans that I strung. It's very coarse, so the bines can attach and spiral along it easily.
huskerbrew wrote:Freshops sells some during the spring, supposedly the same that hop farms use.