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Most survivalists are familiar with the traditional space blanket, also known as the Mylar blanket. Almost all pre-made survival kits, like the kinds that come in water bottles, have a space blanket in them. Even though space blankets are very thin and don’t seem like they could give you very much warmth, the truth is that they are based on NASA science. They are able to reflect heat back to you, something that other kinds of blankets can’t do, and it makes them a nifty little thing to have, especially when you have a source of heat, like a fire.
It turns out, though, that space blankets are useful for more than preserving body warmth. Let’s look at three such uses:
1. Waterproofing a shelter
Many people won’t bother using space blankets as a part of their survival shelter because, the blankets being so thin, they assume it will tear easily and be ruined. There is some validity to this, since it is actually quite easy to get a small rip in a space blanket just by tying or stabbing it to a tree.
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But space blankets do have one very valuable property: They are waterproof.
Source: http://www.offthegridnews.com/extreme-survival/3-survival-uses-for-space-blankets-you-probably-dont-know/