I have Campmors' less expensive 9'x9' nylon tarp. Folded, it fits nicely in my hi tech BOB, a german army daypack. Be aware, all these tarps will suffer from UV breakdown given enough field use. Mine slips nicely into a cloth map envelope against the back, making for a little comfort improvement. All tarps should have pre cut and knotted tiedown lines. Sometimes in the field when a storm comes up, or you've dawdled to long and the suns gone down a few minutes can mean the difference between comfort and misery. I count a quality sleeping bag and tarp right up there with the knife and firemaking in these 'top 10 lists.' The psychological placebo given by 'place' is very powerfull, regardless of how thin the material.