Big Agnes Cinnabar-40 (850 Downtek)

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Vendor: Big Agnes

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Our burliest expedition bag to date, the Cinnabar will quickly become your best buddy whether summitting 8000m peaks in the Himalayas or trekking across Antartica on a self-supported mission. Built with a superlight, high-tear strength shell, insulated with 850 fill power DownTek™ water-repellent down, and designed with body mapped, thermally efficient baffles, this bag has your back (and all other body parts) when conditions make that a necessity.

Specs + Sizing

Bag Weight Small: 4lb 6oz / 1.98kg / Regular: 4lb 10oz / 2.1kg / Long: 4lb 14oz / 2.21kg
Fill Weight Small: 48oz / 1.36kg / Regular: 50oz / 1.42kg / Long: 52oz / 1.47kg
Compressed Bag Size Small: 10" x 8" / 25 x 20cm / Regular: 11" x 8.5" / 28 x 22cm / Long: 13" x 8.5" / 33 x 22cm
Stuff Sack Size Small: 10" x 21" / 25 x 53cm / Regular: 10" x 21" / 25 x 53cm / Long: 10" x 21" / 25 x 53cm
Sleeping Bag Type Traditional Mummy Bags


  • Our warmest expedition bags for summiting 8000m peaks or self-supported missions across Antarctica
  • Specialized fit designed for sleeping in layers and changing inside the bag
  • Baffle shape maximizes loft while keeping liner and heat close to the body
  • Side-access zipper on opposite side of full zipper for quick-access and heat retention
  • Internal mesh stash pocket for phones and other little ditties 
  • Insulated tube along upper hood opening seals out drafts when cinched 
  • Oversized draft collar with adjustability
  • Ergonomic footbox with increased insulation
  • Interior bottom of footbox features Pertex® Quantum Pro fabric for durability and moisture management
  • Low-profile cordlock lets you un-cinch the hood with one hand
  • 70" / 178cm YKK #5 anti-snag locking zipper for a smooth, quick zip
  • Zipper Garage
  • Interior fabric loops for sleeping bag liners
  • Streamlined exterior loops for hang drying or storage
  • Storage sack & stuff sack included 

Construction + Materials

  • Shell is Pertex® Quantum Pro nylon rip-stop
  • 100% recycled Pertex® Quantum Pro combines a tightly woven face fabric with a microporous coating to deliver a high level of water resistance while remaining lightweight, soft and breathable
  • Lightweight polyester taffeta lining featuring a wick finish that spreads moisture out for quicker drying and optimal moisture management
  • 850 fill DownTek™ repels water while maintaining insulating value - bluesign® Certified PFC free water repellent chemistry
  • Insotect Flow™ vertical baffles contour to your body to provide a more comfortable fit and keep you warmer

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