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I've havent noticed any strech, here's what I'm using:

http://www.homedepot.com/buy/building-materials/concrete-cement-masonry/marshalltown/500-ft-braided-masons-line-fl-yellow-22366.html

I use Mason Line (braided) from Home Depot, its super light and super tough. Oh and it's 6 bucks for about 500'. I also cut 10 inch shock cord and tie in a loop then attach the loops to my Superfly...