550 cord, paraline, paracord, parachute line, call it what you will, 150 feet of mil-spec parachute line should be a part of your gear.
As I think back over nearly 46 years of teaching survival skills and about the same amount of time beating about the bush, I don't think I have ever been without some parachute cord. I have used to to build shelters, catch fish, weave nets, make stronger rope, for emergency dental floss, as sewing thread, to retrieve water when I was cliff-bound and yes, parachute line has lowered me to the ground when I jumped out of an airplane while I was in the Air Force. Simply put it can truly be a life saver!
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What is parachute line? Parachute line is made up of a tubular case containing seven pieces of thinner, nylon threads each of which can be further separated into three even finer threads.
The tensile strength of a piece of line is 550 lbs. The tensile strength of one piece of the inner thread is about 35 lbs.
I don't know what the tensile strength of the very smallest fibers is - probably around 8 or 9 lbs. At this point the material is useful as a dental floss substitute, sewing thread, fishing line and even suture material.
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As I said in the beginning, 150 feet in 25 foot lengths, should be included in your gear. There's no way to improvise a line from natural resources that comes close to the strength, utility and usefulness of parachute line. Check out http://www.shop.outdoorsafe.com/Parachute-Line-Parachute-Line.htm