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Compare Best Winter Sleeping Bags head to head
Pick any two picks from this list and see specs, current price, pros, cons and reader ratings side by side.
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#7 on this list
CWM -40
Marmot
The classic deep-cold workhorse. Overbuilt draft tubes and a full-length two-way zip.
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- How we assessed it
- Specification researched
#8 on this list
Redline -20°C
Mountain Equipment
British down expedition bag with a hood that cinches to a coin-sized hole and stays put.
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Specs side by side
| Spec | CWM -40 | Redline -20°C |
|---|---|---|
| Maker | Marmot | Mountain Equipment |
| Model | CWM -40 | Redline -20°C |
| Temp Rating | -40°F (-40°C) | — |
| Insulation | 800 Fill Power Goose Down | 800+ Fill Power Goose Down |
| Shell Fabric | Pertex Quantum | DRILITE Loft II |
| Zipper | Full-length, Two-way | — |
| Temperature Rating | — | -20°C (-4°F) |
| Zip Position | — | Left Hand |
What our reviewers liked and didn't
CWM -40
- Uncompromising warmth in extreme cold
- Excellent draft management and insulation
- Highly durable shell and zipper construction
- Generous interior space for layering
- Proven track record in harsh conditions
- Heavy and bulky compared to less extreme bags
- Significant investment
- Overkill for temperate winter use
Redline -20°C
- Exceptional warmth for extreme cold, genuinely rated for -20°C
- Superb hood design effectively seals in warmth and stays cinched
- DRILITE Loft shell offers excellent water resistance and durability
- High-quality 800+ fill power down provides efficient insulation
- Robust construction built for expedition-level abuse and longevity
- Significant financial investment, priced for serious users
- Bulkier and heavier than less insulated winter bags
- Overkill for temperate winter camping or less extreme conditions
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