This from an email today: You were asking for para cord information. I don;t have a lot but here's what I've got... For boot laces when in the Marines we used to remove the cord from the the outer sheath. This leaves just the sheath, which we were told has 150# test. The para cord is supposed to be 550# test when used as-is. Then, we'd melt the tips into a point. Let cool. Next, go to your nearby electronics store or electric section of a big box hardware store. Get some hear shrink electrical insulating tubing in black or whatever color you want. Cut a 1" piece, slip over the ends, then shrink with heat to make a shoestring-like tip to make threading easier. We also use this to any other purpose when we needed 150# test, not the 550# test. Once I did not have a rifle sling and had to walk many miles with my rifle. I doubled over a long piece of para cord and braided a piece long enough to act as a sling. I tied this to the rifle and had a serviceable sling. Once on a winter camping trip the zipper in my tent failed. I stripped the string out from the inside of the 550 cord and used one piece as a large thread. Using a knife point to make small holes, I threaded the string through the two sides and sewed the hole back up. Given that what one can do with 550# cord is limited only by one's imagination, the main thing is to make sure you have enough of it on hand when you need it.