Highly water-resistant and built from durable fabric. High quality seams, stitching, and zipper. Comfortable. Olive drab green, so it blends in with the environment. Resists punctures and tears. Reflects back 70% of body heat.
Is a bit tight, small; not really for anyone tall or large. Pricing is a little high. Some complaints that it doesn't keep you warm if temperatures drop lower than 40 degrees Fahrenheit.
A number of different kits come with option such as a knife, compass, fire starter, and pocket tool. Three foot by seven foot size, and weights 5.8 ounces. Constructed of a heavy-duty aluminized PE interior material. Priced very low, and includes a drawstring carry bag.
Some buyers report that the material is very thin and tears easily.
Comes 2-to-a-box, each with its own carry bag. Constructed of durable double-sided Mylar material. Waterproof and windproof. Reflects back 90% of body heat. Decent price, particularly for 2. Packs up small and light. Well made and durable.
On the small side, so it's not really built for larger people. Some complaints that there are no zippers or cushioning with these.
Comes with a nylon sack for storage, a 120-decible emergency whistle, and a 550 pound nylon core drawstring. Ultra-lightweight and compact. 26um Mylar resists tears and punctures. Reflects 90% of body heat back to you. Weights 4.1 ounces. Good size, even for larger people.
Some reports of the carry sack ripping easily. Bag isn't very breathable, allowing condensation to form on the inside.
Available in Safety Orange or Tactical Green. Material is an ultra-lightweight HeatEcho reflective polyester film. Reflects 90% of your heat back to you. Weights 4.8 ounces. Tear-resistant, as well as wind and waterproof. Works well. Large-sized bag. Reinforced taped seams.
Make sure you keep your head (and breathing) out of it, as condensation easily builds up to puddle proportions. Some reports that the material here is very thin and rips easily.
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A bivy or bivouac sack is a sleeping bag with waterproof, windproof nylon covering. It can keep moisture and cold out even in snowy weather. It’s useful to hikers and climbers and for survival during natural disasters. Bivy sacks are made to withstand rough weather conditions, though some are more durable for repetitive use while others are suitable only for emergency situations. Bivy sacks tend to pack up small and weigh little for easy transport over long distances. All help keep your body heat in with some having body-heat reflection ratings between 70% and 90%. Not all bivy sacks can accommodate tall or large body sizes. Some come with extra survival tools like a compass or emergency whistle.
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