For those who care so much about lightweight backpacking, the bivy is a good choice for shelter because it’s lightweight, quick and easy to set up and you get to look at the stars while you try to fall asleep.
It may not be a good idea in bear country though because those who sleep in the open (like you would in a bivy sack) are more likely to be attacked by bear than those who sleep in a tent. Of course a tent is no guarantee that you’ll be safe from bear attacks but it’s a serious psychological barrier for a bear looking for food.
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