Quick Answer
When choosing a bivy sack, consider your body length and the space you need to comfortably fit with your gear, usually a sleeping bag and emergency space blanket. A general rule of thumb is to choose a bivy sack that is 6-12 inches longer than your body length. This allows for comfortable movement and space for gear.
Measuring for a Bivy Sack
To determine your body length, lie down on a flat surface and measure from the base of your neck to your heels. Include any additional space you need for a sleeping bag and emergency space blanket, usually 6-12 inches. This measurement will give you a rough estimate of the bivy sack size you need.
Bivy Sack Size Chart
Use the following rough estimates to choose a bivy sack size:
- Small: 5'6" to 5'10" (168 cm to 178 cm) - 50-60 inches (127 cm to 152 cm) long
- Medium: 5'10" to 6'2" (178 cm to 188 cm) - 60-70 inches (152 cm to 178 cm) long
- Large: 6'2" to 6'6" (188 cm to 198 cm) - 70-80 inches (178 cm to 203 cm) long
Choosing a Bivy Sack
When selecting a bivy sack, consider its weight, water resistance, and packability. If you plan to use it in extreme weather conditions, choose a waterproof and breathable bivy sack. If you prioritize weight savings, look for a lightweight option.
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