Black Diamond Bivy Sack
chaos_4life: 
This is one of the lightest, super compact (size of a soup can) bivy sacks out there on the market and for this price it is a steal. Water resistant, tear resistant and added warmth to any mummy sleep system, it is great for that unexpected downpour or just by itself on those warm summer adventures. A must have for the avid outdoorsman(woman)-- outdoors-person!
Black Diamond Winter Bivy Sack
Bsquare: 
I just returned from using my BD winter bivy sack while cycling through France for 2 weeks and it worked very well. I DID NOT USE A TENT, ONLY THE BIVY SACK. It is very roomy and lightweight!As with all water resistent, breathable materials, it allows for condensation to form in cool temps when the humidity is high but it dries very quickly. It worked very well in the rain and was easy to get in and out of. I am very pleased with it.Thank you!
Cheap, Water resistant, packs small, light
fusionboy: 
The zipper can break and its not waterproof but great for emergencies or nights out in the open when all you need to do is keep off the dew.
Great sack
Stu: 
Used the bivvy bag with a PHD bag in Austria at minus 26C and it performed brilliantly. The bag is VERY light, but still surprisingly strong. You may need to pop a bit of string onto the Zip puller to operate with gloves, but otherwise a very good bit of kit.
Lightweight, simple, inexpensive
Nurse Ben: 
I bought this as an emergency bivy for backcountry skiing. It is a great little bag, once I'd consider taking with me on a trek where I might have to do an emergency sleep out overnight. Very small and light, not many extras, no zippers, but certainly a great product for its design, also a nice way to increase sleeping bag warmth rating.
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