User Review: Outdoor Research Aurora Bivy
Design: Bivy Sack
Ease of Setup: Very easy to set up
Weight: 1.5 lbs
Price Paid: $159
The bivy sack works as advertised. I have only used this at altitude because at lower altitudes I will get internal condensation. Using this at altitude and having a temperature differential between the inside and outside of the bag allows it to vent vapor through the Gore-Tex laminate.
It is roomy enough for your bag and even a few small things inside. It is roomy enough to use your clothes as a pillow on the inside.
My biggest complaint is the zipper orientation. If the zipper was on the side, it would be easier to get in and out. With the zipper around the head and chest getting in can be a slight pain.
This is a good bivy sack for a single overnight trip. Great for climbing, but for more comfort and room to live in, one of the new lightweight single wall tents will probably be better if you care to carry an extra 1.5 to 2 pounds.