Originally Posted by ICANHITHIMMAN
dont where cloths in the bag strip down to your draws or less
+10. The more you have on (with the fly zipped) the wetter you get. I sleep in a bivy all the time in the summer when I motorcycle camp on my ADV bike. It's paramount to sleep as close to naked as you can get, the more layers of clothing, the more moisture you give off that collects in the inside of the bivy sack.
I always try to sleep with the fly opened up and if no bad weather, the fly off entirely.
By design, they all sweat a little. You perspire and the bivy material is cooler so it condenses.