Review on Tact Bivvy 2.0: Compact Ultra Lightweight Emergency Sleeping Bag for Survival - Waterproof & Thermal Bivy Sack Cover with Carabiner, Whistle, and ParaTinder - Includes Stuff Sack by Ray Sheptock

This is exactly what I wanted for my hunting and hiking emergency kit. This product has many good reviews. Please note that this is an emergency. This is not a cheap way to replace your sleeping bag when traveling overnight. This is for emergencies, and if you save your head and are prepared enough, it could very well save your life. It is NOT designed for you to put your sleeping bag inside as a cover. If you were outside and there was a terrible rain or snowstorm, you might put your sleeping bag inside. This item does not "breathe” so condensation can collect and get wet in the bag. Honestly I wouldn't use it as a "liner" in my sleeping bag. Again, it does not "breathe” and condensation accumulates. This well-made bag is designed for emergencies and could very well save your life. When you take it out of your pocket, it takes time to put it back in. This is not a sleeping toy for your kids. IF I have to use this bag, I plan on only using it once because I would get tangled and stuck somewhere.