i spent some time yesterday reading archives about tarps. i still have more questions though. the flying diamond, or wedge, shape seems to be most popular --- very spacious, and easy to set up. how do you prevent water from running down the line into the tarp? also, if you had one tarp for the a.t., which would it be, why? is square better than rectangle? do you prefer tie outs on the body in addition to the edges? do you think a flat tarp is more versatile than a catentary (sp?) cut tarp? or how about tarps that are already preshaped (ie: the cave or lair)? i'm thinking of a tarp as a primary shelter. thanks.