1.9 will be durable jim. If you want to be able to lay flat and you're making something like a speer or this: http://www.imrisk.com/testhammock/testhammock.htm the stock answer is you need three or three and a half yards of materiel to get a good lie in it. I make all mine out of a full width (60 inch wide) piece of materiel - you definately want the width, because to lie flatter in the hammock you want to lie in it at an angle, so you want that width.
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