"Maybe we need to use a new term, "bivy" for the standard waterproof bivy that people seem to not like at BPL and use "UL bivy" for the ultralite, water resistant, highly breathable type."
Good point. I have the Katabatic Gear Bristlecone Bivy. It's a fixture in my ultralight setup for the reasons Sean outlined. Tarp is for bad weather and so only comes out then, otherwise sleeping inside the Bivy is perfect on most nights, provides the views, protects from condensation, bugs/mice, wind. At 7oz it's a perfect shelter for most nights.
