Big Agnes Sidewinder SL 20 Sleeping Bag product image
Big Agnes Sidewinder SL 20 Sleeping Bag product image
Big Agnes Sidewinder SL 20 Sleeping Bag product image

Big Agnes Sidewinder SL 20 Sleeping Bag

Color: Legion Blue/Tapestry
Bag Size:
Delivery & Pickup Options

Ship To Me

Store Pickup

  • Designed for side sleepers
  • 650 fill DownTek insulation with water repellent chemistry
  • Cinching insulated tube to seal out drafts

Product Information

Temp Rating

15 to 30 Degrees

Insulation Type



  • Hang dry or store bags with exterior loops
  • Storage sack and stuff sack included


  • Traditional mummy bag designed for side sleepers
  • 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
  • Primary Fill: 650 fill DownTek™ repels water while maintaining insulating value – bluesign® Certified PFC 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
  • 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
  • Works with any pad size or style
  • Shell: nylon ripstop featuring a PFC-free water repellent finish
  • Lining: polyester taffeta featuring a PFC-free water repellent finish
  • Country of Origin : Imported
  • Brand : Big Agnes


Sleeping Bag SizeRegular Long
Minimum Trail Weight2 lb. 4 oz.2 lb. 8 oz.
Temp Rating 20° F20° F
Fill Weight1 lb. 3 oz. 1 lb. 5 oz.
Insulation TypeDown/Synthetic BlendDown/Synthetic Blend
Fill Power650 DownTek/FireLine ECO650 DownTek/FireLine ECO
Shoulder Girth61 in. 65 in.
Hip Girth55 in.59 in.
Fits up to72 in.78 in.
Compressed Volume4.35L 5.8L
Shell FabricRipstop NylonRipstop Nylon
Zipper LocationFrontFront
Stuff Sack Included YesYes
Stuff Sack Size 8 x 17.5 in8 x 17.5 in