I've heard it both ways. Some say that just craming it all int he sack is fine. Other say that it damages the fabric. I've heard that repeated folding in the same places will break down the fabric in those spots.

Your right JP. For my Hammock I use homemade snake skins. I then fold that up and wrap the hanging rope around that. For my Fly, I loosly fold it and then roll it up and put it in a stuff sack. I have the material to sew snake skins for the Fly. If I have the guy line attached permently, I can do the same for the Fly. Setup will be much faster that trying to fight the wind with a large flapping piece of material.