Here's a comment I just posted elsewhere:
Yes, it's the ***** Diamond Lightsabre Bivy.
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I've used it three or four times now. I'm pretty happy with it so far. It's nice and light and takes very little space in my pack. The bivy itself weighs 1 lb 2 oz. The poles and stakes add another 8.5 oz. The Epic fabric is very thin and feels rather delicate but so far it hasn't sustained any damage. I do use a piece of polyethylene plastic as a footprint to protect it because I fear it could puncture easily.
My first time using it last year I got rained on 2 evenings in a row. The rain lasted about 2 hours on each occasion and didn't seem to penetrate. I do suspect that sustained rain for more than a few hours at a time will eventually soak through. Trying to get in or out of it in the rain is not fun but thats just an issue with all bivies. It does not come seam sealed but they do include a tube of sealer so you can seal it yourself. This is a bit of a pain but at least it reduces the cost.
It is advertised as highly breathable though I have had some condensation buildup on my sleeping bag a couple of times. This occurred during low temps under humid and rainy conditions though and I think all bivies suffer this problem under the right conditions. It wasn't a problem for me, just a little dampness on the outside (not inside) of my sleeping bag.
One thing I didn't think about when I ordered it was that it unfortunately zips up on the opposite side that my sleeping bag does. This makes it a little more of a pain to get in and out of but it's not that bad and I've gotten used to it.
My main reasons for buying it were for the light weight and the hood. It feels like you're in a little tent and I can stuff quite a few items (boots, clothes, etc.) in there when I need to. The hood also keeps the mosquito mesh off your face -- or you can completely zip it up if it's raining.
It's sure nice not carrying around a heavy tent, but if I suspect foul weather I lean toward bringing my tent. Thus, overall I'm happy with it.
-Rick
