Gear
Big Agnes Cinnabar -40
Expedition users seeking premium down at a competitive price
Expert reviewed
Topic summary
Expedition users seeking premium down at a competitive price
Key takeaways
- 850-fill DownTek
- expedition mummy build
- technical shell
- High-loft treated down and solid technical construction offer excellent warmth without reaching the very highest prices.
Verification notes
Evidence: expert reviewed. Last verified July 16, 2026.
Editorial take
Big Agnes Cinnabar -40 is a cold-weather sleeping bag with an advertised -40°F rating and 850-fill DownTek; expedition mummy build; technical shell. It is best suited to expedition users seeking premium down at a competitive price.
Not ideal for
- Still heavy and specialized, with less field history than older expedition standards.
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Verified specifications
- Key features
- 850-fill DownTek
- expedition mummy build
- technical shell
Warranty and repair information: contact Big Agnes directly for the most current terms. Big Agnes support
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Data sources & verification
- Manufacturer: Big Agnes
- Last verified: 7/16/2026