Sleeping Bags

Choose the right sleeping bag: temperature rating, fill, and shape.

Mummy sleeping bag with down fill laid out on a campsite mat, product photography

Temperature rating is the most important number on a sleeping bag — and the most commonly misread. A bag rated to 20°F doesn't mean you'll be warm at 20°F. Understanding EN/ISO ratings, fill power, and how bag shape affects real-world warmth makes the difference between comfortable sleep and a shivering night.

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Real sleeping bag buying content — temperature systems, fill comparison, shape trade-offs, and packed weight for the trail.

Buying guide How to choose a sleeping bag: temperature rating, fill, and shape EN/ISO rating systems, comfort vs lower-limit temperatures, down fill power, synthetic vs down in wet conditions, mummy vs rectangular shapes, and what packed weight to target for backpacking.

Why this page exists

Sleeping bag marketing focuses on the lowest number a bag can technically be rated to. That number is a survival floor, not a comfort target. A bag labeled "20°F" may have a comfort rating of 32°F — meaning you'll be cold at 25°F, well above the advertised temperature.

This page explains what the temperature numbers actually mean, how fill power translates to real warmth-to-weight ratio, and why bag shape matters more than most buyers realize.

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Sleeping bags worth searching on eBay

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🔍 Shop Sleeping Bags on eBay →
Big Agnes Lost Ranger 15 Goose Down Sleeping Bag 72X50 Down sleeping bag Best warmth-to-weight ratio available; compresses smaller than synthetic. Look for fill power (600–900+) and check whether down is hydrophobic-treated. View on eBay → 50 F Rectangular Sleeping Bag Backpacking sleeping bag Trail-optimized for packed size and weight. Mummy shape essential; target under 2 lbs for 3-season use at most temperatures. View on eBay → USGI Intermediate Cold Weather SLEEPING BAG Urban Grey VGC Cold weather sleeping bag Rated for 15°F and below. Check EN/ISO comfort rating, not just the advertised lower limit. Draft collars and draft tubes matter in true cold. View on eBay → North Face 0 Degree -18 C Elkhorn Mummy Sleeping Bag Sleeping bag 0 degree 0°F lower limit — comfort rating typically 15–20°F. Appropriate for winter camping at temperate elevations. Pair with an insulating sleeping pad (R-value 4+). View on eBay → US Military Intermediate Cold Weather Sleeping Bag Mummy Style 3 Options Mummy sleeping bag Tapered cut follows body contours; minimal dead air space to heat; hood seals head warmth. Standard shape for any bag rated below 40°F. View on eBay →
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