Here are a couple of links that might be useful. Here are some places where you can buy advanced cords: http://www.usrigging.thomasregister.com/olc/usrigging/pelifix.htm<br>http://www.samsonrope.com/products/recmarine_rigging.cfm<br><br>Here is a site that did some interesting tests on break strength (and, more important how different knots affect break strength): http://www.amga.com/info/Comparative%20Tes%C9rength%20Cord.pdf<br><br>I am certainly not suggesting that folks use thin diameter spectra or tecnora (or the like) as their first choice for climbing or life lines. In the same vein, I don't suggest that anyone get dropped off in the middle of the woods with only a knife and an altoids tin full of supplies. <br><br>That said, I think it is reasonable to inquire about whether low diameter high strength cords should be used as replacements for paracord that is so often found in kit and exactly what advantages and disadvantages each has.<br><br>