Quick Answer
Regulations regarding bivy sack use in specific parks vary, but some parks have restrictions on overnight stays in shelters smaller than 35 square feet. Bivy sacks may be prohibited in some areas, especially in sensitive ecosystems. Always check with park authorities before using a bivy sack.
Park Regulations for Bivy Sacks
When planning a backcountry trip, familiarize yourself with park regulations regarding shelter use. In Yosemite National Park, for example, bivy sacks are not allowed in the park unless they are specifically designed for emergency use and have a minimum floor area of 35 square feet. This regulation is in place to protect sensitive alpine environments.
Shelter Space and Emergency Blankets
In areas where bivy sacks are permitted, be mindful of the space they occupy. A good rule of thumb is to use a shelter that has a floor area of at least 35 square feet per person. In extreme weather conditions, emergency space blankets can be a lifesaver. These lightweight blankets can retain up to 90% of body heat and are essential items to carry in your backpack. When using a bivy sack or any other shelter, always store your emergency blanket in a dry and accessible location.
Bivy Sack Techniques and Considerations
When selecting a bivy sack, consider the weather conditions and terrain you will be in. A waterproof bivy sack with a minimum of 1-inch gusseted seams is essential for withstanding rain and wind. In areas with high humidity, choose a bivy sack with a breathable membrane to prevent condensation buildup. When setting up your bivy sack, always use a tarp or plastic bag to protect the floor and keep your gear dry.
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