I used an Integral Designs bivy for six months on the AT and had very few problems. ID is a Canadian company and I got mine from MEC. But I don't think I would do that again without a tarp. I still use a tarp/poncho for shelter, but I carry rain gear as well. Even though my experience was good, I would not recommend the bivy alone. Besides, you need some rain protection anyway, so use a poncho and you have your tarp. best, jcp