I'm looking for a bivy sack for an extended road trek which will touch all 48 contiguous states. It may never happen, but it's getting closer to being a possibility.

Most of the camping will be stealth camping which is why I don't want a tent. The way the route is planned, there shouldn't be extended periods of bad weather too far from a city where I could get a motel.

The bivy sack must be a dark color so it won't be spotted easily. It needs to be light and compressible. I've decided to go super light and carry a 44 liter pack. It also needs to be durable, since it will get about a year of use, although there will be many nights I don't sleep in it.

I'll probably match it with a high quality synthetic bag from WM.

My first guess at a bivy sack is this one.
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http://48statehike.blogspot.com/