I hang from this also: AmSteel 1/8" Dyneema cord: rated to 1800lbs or so. http://www.apsltd.com/Tree/d3000/e827.asp
I use one piece about 30' long. It's both my ridge line & the suspension cords. It works GREAT! As the copy says, minimal stretch.
Prior to this, I tried:
25' of 1/2" climbers accy cord. Even the second night in the same spot, I would still need to take up slack 3 or 4 times a night, to keep from sleeping on the ground.
25' of 4/3" flat webbing, nearly as bad stretch as the accy cord.
Both took up a major amount of space in my pack and was very heavy. The 30' of Dyneema I can nearly hide in my hand, it takes up about as much space as a golf ball & 1/2. I've never weighed it, but it's way light. I tie to trees with the 2 ropes supplied with the hammock, using them as "tree huggers" They don't seem to stretch, & weigh little. They also take up little space. The ropes & my hammock (& snake skins & hammock sock) fit inside the very small top pocket on my pack.