How to Choose a Mummy Sleeping Bag? Temperature Ratings, Fill Power & Fit Explained
Choosing the right mummy sleeping bag can mean the difference between a restful night under the stars and a cold, uncomfortable experience. Here's a quick, original guide to help you understand the three most important factors: temperature ratings, fill power, and fit.
Temperature Ratings
Always check the EN/ISO temperature rating. Look for the "comfort" rating if you're a cold sleeper or the "limit" rating if you sleep warm. Choose a bag rated slightly lower than the coldest temperature you expect. For 3-season hiking, a 20°F (-6°C) bag is a solid choice.
Fill Power
Fill power measures the quality of down insulation. Higher fill power (like 850 or 950) means better warmth-to-weight ratio. If you’re ultralight backpacking, go for high fill power—it keeps you warm without bulk.
Fit
Mummy bags are designed to hug your body to retain heat. Make sure the fit isn’t too tight—restricted movement can lead to cold spots. Taller or broader campers should look for long or wide models for comfort without sacrificing efficiency.
Final Tip
Match your sleeping bag to your environment, body type, and backpacking goals. The right choice keeps you warm, light, and well-rested—no matter how rugged the trail.
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