Quick Answer
A bivy sack is best used when it's raining, snowing, or extremely windy, providing a lightweight and compact emergency shelter. It's also ideal for backcountry skiers or hikers who may get caught in bad weather. Typically, bivy sacks are employed when other camping structures are not feasible.
Choosing the Right Conditions
When to use a bivy sack largely depends on the conditions you’re expecting or facing. If the forecast indicates a high chance of precipitation or extreme winds, it’s best to have a bivy sack as a backup. Additionally, consider using it when setting up a campsite in an area prone to rapid weather changes. For example, in the Pacific Northwest, rain can pop up suddenly in the late afternoon, making a bivy sack a valuable asset.
Setting Up a Bivy Sack
A bivy sack can be used in conjunction with a space blanket or emergency bivvy to create a more robust shelter. To set it up, first, locate a relatively flat and dry spot. Remove any debris and smooth out the surface. Next, inflate your sleeping pad to its recommended pressure, then place it inside the bivy sack. If it’s extremely cold, you can also use a space blanket to line the sack and create an insulating layer.
Emergency Situations
In emergency situations, a bivy sack can be a lifesaver. If you’re caught in a sudden storm or your tent fails, a bivy sack can provide a dry and relatively warm space to wait out the bad weather. When using a bivy sack in an emergency, focus on getting dry and staying warm. Remove any wet clothing and use your space blanket to insulate yourself. Stay as low as possible to avoid wind and precipitation.
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