Bests & Worsts Reviews from Amazon

I've got 4. They do what they claim. I used it at 40 degrees and was comfortable with only jeans and a light nylon shell jacket. No significant condensation in my experience. They seem to be marketing this as an ultralight alternative to a 1 or 2 season sleeping bag. I keep one in my daily travel bag that goes between job sites, along with a Klymit 9.1 oz inflatable pad. Those two items together form a complete indoor sleep setup that weighs a total of 1.1 lbs and fits in the corner of a day bag, for about $120 total. Wear a few extra layers for warmth, and use a light head cover in rain, and this item does the job in less than enjoyable outdoor conditions. I don't think there is any comparable option that is lighter or more compact. It 'feels' flimsy, but so far has stood up well to regular use. EDIT: Used this on a damp night outside when temps dipped to 38 degrees. Things didn't go so well in this situation. I had a few additional bulky layers on to stay warm, so the fit was very tight. I managed to rip the draw cord while adjusting to find a comfortable position in the middle of the night. It's gonna be hard to repair since it broke all the way at the base of the cord. Going back and forth between a couple other bivy options, I really notice the lack of space in this product. I still like this item for indoor travel sleeping - that's where it's destined to stay for me. I'll stick with tougher and bigger bivy bags for any real outdoor use. For a few ounces more, a bigger bag with an extra layer of sleeping clothes feels much more practical to me.