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Reviewed in the United States on September 23, 2024
This is one of those items I have carried with me into the backcountry for years but never used, until recently. Last week, I used it for the first time. I was 3 days' walk from any trailhead when an early season snowstorm came through. Hail, wind, snow, and freezing rain for 2 days. I had a 4 season tent, but the condensation inside the tent (despite best efforts at venting) quickly started to soak through my down sleeping bag. The wind chill was 12 degrees F with temps around 28 F. As soon as I noticed the down sleeping bag getting wet, I slid myself and the sleeping bag into this Mylar bivy, laying on a 4 season sleeping pad, and stayed plenty warm for 2 full days and nights. At the end of the storm, my down blanket was wetted completely through from condensation (both from the tent and additionally from the mylar bivy). I was soggy and wet, but amazingly, plenty warm. Without this bivy, I think there is a decent chance I would have gotten hypothermia.The bivy developed small tears throughout those 2 days from my movements, especially from the bivy catching on one of the trekking pole points that made up my tent center pole. There are probably 6 small holes in the bivy now. The holes did let in a small draft and additional moisture from the snowstorm, but this did not affect my ability to stay warm.I'm buying another one to replace the one with holes. It will continue to come with me whenever I go more than a few hours' walk from a trailhead. I backpack and mountaineer with a very light gear setup, but this is light enough to not even think about it, given its value. I'm going to put the other one in my car for winter.
AJ
Reviewed in the United States on July 13, 2024
Fantastic savings for a two pack. Great to keep in my vehicles first aid kit.
CJ
Reviewed in the United States on August 31, 2022
Okay, I rated these 5 stars without having been stranded in the wilderness and needing to use it. With that said, I like this bivvy sack. It's every bit as good as a mylar blanket, and of course, has the benefit of being a bivvy sack and not a sheet of tin foil.It packs up small and has a nice little bag, so it's going to fit perfectly in my dry bag with my towel, and other assorted things.I don't have other bivvy sacks to compare to, so I can't speak confidently about thickness, tear resistance, etc. It's pretty thin. It wouldn't take a lot to tear it, so a little care would be in order. Don't roll around on abrasive or sharp stuff and it should be fine. But seems to me to be perfectly fine for its intended emergency use.It has an anemic little whistle on it. It's not loud. Get a real whistle that you know can be heard in outer space. I wouldn't stake my life on the attached whistle.Aside from the mostly useless whistle, which is not why you would buy this, I like this bag. I am going to pick up a couple more to stash in my vehicles and my hiking backpack.
David W.
Reviewed in the United States on July 11, 2022
This item is designed for extreme survival purposes – not for sleeping comfort. Weighing 4.7 ounces on my digital scale, this item easily fits in your pocket. I keep this type device in each of my “Get To Safety” 72-hour emergency response bags. You can also keep spares in your vehicle glove box.I consider this an improvement over a typical space blanket style device as the 84 x 36-inch orange exterior – silver interior “bag” design of this item allows you enclose your body in a “wrapper” that will reflect about 90% of your body heat back to you. Note that it does NOT insulate conductive heat loss from physical contact with the ground. Material is extremely thin and although it is puncture-resistant, you can easily punch holes in it through contact with sharp items on the ground. Best practice is to insulate physical contact using leaves, pine needles, etc., or minimally ensuring that the ground where you’ll sleep is cleared of rocks and twigs. Also consider that this survival bag does not “breathe” and that moisture will be trapped/accumulate inside the bag. Embers from fire/direct flames will burn a hole in this item.Very small survival whistle included on the carry bag draw string may be 120db at a 2-foot distance, but in my experience, the sound will not carry any distance and in my opinion, this feature is not a reliable replacement for a high-quality survival whistle.At price point of just under 15 bucks at time of writing, I find this item to be an excellent investment of your survival preparedness budget dollars. U.S. Quarter Dollar shown in my photo for sizing comparison.Thanks for indicating if you found my comments and photo helpful in your consideration of this product.
Dave Hamm
Reviewed in the United States on October 14, 2022
Got this for a replacement/upgrade for my search and rescue pack. I carry several of the Mylar heat reflective blankets with me. Hypothermia can be serious and can happen quickly in most any weather. These Mylar blankets work. I like the design of this. It is vey small. Fits in the palm of your hand. The bag is like a tyvek material and could be useful in an emergency itself. It has a length of paracord and an emergency whistle. The whistle may not sound loud like a referee’s whistle but the sound carries and is attention getting. The orange color is very noticeable and will absorb external heat. The inside will reflect body heat. It can be used like a sleeping bag or by cutting a slit in bottom seam could be worn like a poncho. It can be cut open to make a blanket as well as a shelter that will reflect heat from a small fire. This is not a replacement for proper gear. It is meant to have in case of emergency. This is a must have piece of survival equipment. Perfect for anyone who kayaks, hunts, hikes, spends time outdoors, or has a home emergency kit. I would highly recommend and will be purchasing more.
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