Gear
Marmot CWM -40
Roomier extreme-cold mountaineering and base camps
Expert reviewed
Topic summary
Roomier extreme-cold mountaineering and base camps
Key takeaways
- 800-fill down
- expedition cut
- substantial draft collar and hood
- A long-running expedition design with dependable warmth and a less restrictive fit than some narrow technical bags.
Verification notes
Evidence: expert reviewed. Last verified July 16, 2026.
Editorial take
Marmot CWM -40 is a cold-weather sleeping bag with an advertised -40°F rating and 800-fill down; expedition cut; substantial draft collar and hood. It is best suited to roomier extreme-cold mountaineering and base camps.
Not ideal for
- Bulky, costly and not the lightest in its class.
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Verified specifications
- Key features
- 800-fill down
- expedition cut
- substantial draft collar and hood
Warranty and repair information: contact Marmot directly for the most current terms.
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Data sources & verification
- Last verified: 7/16/2026