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Big Agnes
Cinnabar Sleeping Bag: -40F Down

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Cinnabar Sleeping Bag

The Cinnabar range of sleeping bags is the warmest range from Big Agnes, and this Cinnabar Sleeping Bag is the warmer of the two. Its sub-zero rated down insulation is intended for expeditions like 8000m summits, self-supported missions across Antarctica, and all-around winter camping and backpacking. Despite being the warmest, the down insulation is surprisingly light, lofty, and packable. Big Agnes treated the down to retain its lofty warmth if it ever got wet, which would be difficult to do considering water-resistant, windproof Pertex Quantum protects it from winter's weather. The footbox features a burlier Pertex Quantum Pro waterproofing that comes in handy when moisture inside the tent drips down the walls and onto your feet.


  • The warmest Big Agnes sleeping bag for 8000m expeditions
  • 850-fill down insulation has a -40F temperature rating
  • DownTek hydrophobic coating keeps the down lofty in wetness
  • Pertex Quantum shell is windproof and water-resistant
  • Pertex Quantum Pro footbox adds waterproofing where it counts
  • Draft collar runs down full-length zipper and around hood
  • Internal mesh pocket stashes phones, headlamps, and other essentials
  • Stuff and storage sacks included
  • Item #BAGZ28E
[shell] Pertex Quantum (100% nylon ripstop) [lining] 100% polyester taffeta
850-fill down, DownTek
mummy (room for layering]
full-length, YKK #5
Max User Height
[small] 5ft 5in [regular] 6ft [long] 6ft 6in
Shoulder Circumference
[small] 58in [regular] 64in [long] 66in
Hip Circumference
[small] 58in [regular] 58in [long] 60in
Foot Circumference
[small] 38in [regular] 40in [long] 42in
Bag Length
[small] 5ft 5in [regular] 6ft [long] 6ft 6in
Draft Tube
zipper, hood
1 internal
Pad Retainer
Fill Weight
[small] 2lb 13oz [regular] 3lb 2oz [long] 3lb 6oz
Storage Sack
Stuff Sack
Stuff Size
10 x 21in
Claimed Weight
[small] 3lb 12oz, [regular] 4lb 9oz, [long] 4lb 14oz
Manufacturer Warranty

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