....When you really, really need them bivy's are worth their weight in gold. ..... You also are completely sheltered from wind, rain, sleet and snow.....
In my opinion the shelter aspect is by far the biggest value of a bivy. If you are wearing reasonably adequate clothing and can improvise some insulation from the ground underneath you (a foam pad, for example), with a bivy you can make it through the night. You may not sleep much, but you will survive.
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