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Big Agnes Zirkel SL +20 Sleeping Bag

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The Big Agnes Zirkel SL +20°F mummy sleeping bag is ideal for three-season camping. The attached sleeve keeps you securely attached to your sleeping pad, providing constant insulating warmth.

  • Superlight, prime 800-fill-power goose down delivers an excellent combination of warmth, light weight, compressibility, durability and value
  • Vertical baffle Flow Construction features internal Flow Gates—vertical chambers with internal mesh gates that keep insulation from shifting up and down
  • Underside insulation has been eliminated and replaced with a sleeve for a Big Agnes pad or any 20-in.-wide sleeping pad, sold separately
  • Pertex® Quantum nylon ripstop shell is lightweight and durable, and offers silky softness that enhances the insulation's loft
  • Ripstop nylon shell has a water repellent finish to shed water
  • Nylon taffeta lining is soft and breathable
  • Down-filled collar at the top of the bag seals around the neck to prevent warm air from escaping and cold air from entering
  • Continuous oversize draft wedge insulates the connection between the bag and pad to prevent cold air from entering
  • Large draft tube located behind the zipper prevents warm air from escaping and cold air from entering
  • Built-in pillow sleeve lets you stuff a jacket or a pillow inside
  • Interior fabric loops stabilize a sleeping bag liner, sold separately
  • 2-way, full-length YKK zipper will zip to another bag with opposite zipper configuration
  • Big Agnes Zirkel SL +20°F mummy sleeping bag includes a recycled mesh storage sack and a nylon stuff sack


Item 811077

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Big Agnes Zirkel SL +20 Sleeping Bag Specs
EN lower limit (rating for men)
20 degrees Fahrenheit
-7 degrees Celsius
2 lbs. 11 oz. / 2 lbs. 6 oz.
1.2 / 1 kilograms
Ripstop nylon microfiber
800-fill goose down
16.5 / 15.5 ounces
Nylon taffeta
78 / 70 inches
72.5 / 67.5 inches
69 / 64 inches
7.5 x 15 inches
EN comfort (rating for women)
Temperature rating (F)
Temperature rating (C)
Weight - metric
Insulation type
Fill weight
Sleeping bag shape
Fits up to (in.)
Shoulder girth (in.)
Hip girth (in.)
Stuff sack size
Stuff sack volume

Big Agnes Zirkel SL +20 Sleeping Bag

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