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Big Agnes Sidewinder SL 20

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In short

Specifically designed for those who sleep on their sides, the Big Agnes Sidewinder SL is engineered and ergonomically contoured to ensure warmth, comfort, and ease of use in any position you settle into. Constructed with features you expect from a traditional mummy bag with additional body mapped insulation to optimize warmth where you need it and minimize pressure points and other ‘side effects’. The Sidewinder SL is a side sleeper’s dream bag with technical features that roll seamlessly from one adventure to the next, and from one side to the other at night.

In detail

  • Shell: nylon ripstop featuring a PFC-free water repellent finish
  • Lining: polyester taffeta featuring a PFC-free water repellent finish
  • Primary Fill: 650 fill DownTek™ repels water while maintaining insulating value, with bluesign® Certified PFOA and PFOS free water repellent chemistry
  • Body Mapped Fill: FireLine™ ECO Synthetic Insulation, 100% post-consumer recycled polyester, featuring low-denier fibers that are tightly woven and provide high loft, compressibility, high weight-to-warmth ratio, and durability
Big Agnes Sidewinder SL 20 R L
Comfort °C -1 °C -1 °C
Limit °C -7 °C -7 °C
Extreme °C -25 °C -25 °C
Fill weight (grams) 538 604
Weight (kg) 1.02 1.13
Insulation material 650 fill DownTek™ plus additional FireLine™ ECO Synthetic Insulation (body mapped) 
Up to bodysize <183 cm <198 cm
Shoulder- / Hip- / Footwidth (cm) 155 - 140 - 91 cm 165 - 150 - 102 cm
Compressed Size 16x20 cm  19x20 cm
Shape Mummy Mummy
Intended use Side sleeping adventures Side sleeping adventures

Sizing:

  • Regular: fits up to 6' / 183cm
  • Long: fits up to 6'6" / 198cm
  • Works with any pad size or style

Features:

  • Specifically designed for people who sleep on their sides with a technical fit, patterned to move with you as you roll from one side to the other
  • Close fitting, jacket-style hood keeps insulation close to the body without sacrificing mobility
  • Keep pillow in place with unique Pillow Barn made of stretch mesh material with interior access from either side for easy adjustment
  • Optimized warmth and minimized pressure points with body mapped insulation
  • Improved shell fabric and lining with PFC-free water repellent finish
  • Down fill with a PFC-free water repellent finish throughout the bag provides lofty warmth while synthetic insulation helps alleviate common pressure points in the hips and feet
  • Optimized fit and thermally efficient footbox is patterned to mimic the shape of your foot position while lying on your side
  • Smooth, quick zip with anti-snag locking zipper with no-draft zipper garage, and long, ambidextrous zipper
  • Easily adjust hood without unzipping using low-profile internal cordlock access
  • Seal out drafts by cinching insulated tube along upper hood opening
  • Hang dry or store bags with exterior loops
  • Storage sack & stuff sack included
Important details
Insulation Down
Comfort temperature -10° / 0°
Weight 1000 - 1250g