I experimented with an orange survival sleeping bag and this Mylar sleeping bag. I tried the orange bag first.<br /><br />It was 20 degrees out with giant icicles hanging from the pipes. I went out on to my cedar deck wearing socks, pants, and a t-shirt. I was shivering while unfolding the orange bag. I stepped into it, sat down, then stretched out and wrapped it around me. This bag is only plastic with no reflective properties and within two minute I was shivering again and the wood deck underneath me felt like a slab of ice. This bag would be great to keep the rain off, but offers no warmth.<br /><br />I then tried the Mylar bag in the same conditions. I went from shivering to very comfortable within five minutes. I wrapped it around me so that it formed a hood over my head and I could direct my breath outside of the bag. I then relaxed for about a half an hour, listening to music on my phone, and extremely comfortable in just the socks, pants, and t-shirt. The deck was cool, but not like the slab of ice I felt before. I could feel a moderate winter breeze on my face but the bag kept it off of my body. I was comfortable and very impressed.<br /><br />After about a half hour, some condensation started to form on the inside of the bag where it touched my bare skin. It would probably work better wearing long sleeves. I opened the bag a little to let in some air and that helped. It’s a matter of finding the sweet spot of ventilation and heat retention.<br /><br />For camping, this bag would be good as an addition, but not stand alone. In a survival situation, however, this bag would likely save your life.
Rating: [5 of 5 Stars!]