I read an article about small rodents chewing on synthetic ropes and actually downing hanging canoes. So although I have a pulley system to get the canoe up, I use chain for the boat to sit on.
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For ridgelines I almost always go to "Zing It" , which is a dynema cord ... nothing stronger or lighter is available. It is pretty widely available, this is one of the suppliers I use
Made from Dyneema fiber, this rope yields the highest strength, lightest weight, lowest stretch and longest wear life available. Shop our products today!
dutchwaregear.com
Brian