I used some 1/8" jute twine from the garden store and it didn't cut the mustard. It was a windy season, which didn't help, and I had to replace my supports because the first ones were too flexible. Re-tying the strings didn't help, either. Last year (less wind, no replacement of supports, but smaller bines) I didn't have trouble.
Next year I will use something heavier, perhaps nylon or polypropylene cord. I'd like to find something UV-protected but for the price of 1/4" PP, I could junk it each year.
Natural 20 Brewery
Yes, that *is* beer. Water, malt, hops, and yeast mean it's beer. Go ahead and try a glass...