Item # BGA9J201M

Big Agnes Sidewinder 20 Degree (2026) Sleeping Bag

Purchase Sidewinder 20 Degree (2026)

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Big Agnes Sidewinder Sleeping Bag Series

By Cheyne

Enwild Gear Specialist

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Designed for side sleepers, the Big Agnes Sidewinder 20 Degree Sleeping Bag pairs lofty down insulation with a movement-friendly fit for lightweight, packable comfort and dependable three-season performance on the trail.

Description

Side-sleeping comfort in the backcountry: The bag's technical and strategic patterning allows the bag to move with you as you roll from one side to the other. The optimized profile and thermally efficient footbox is patterned to mimic body position while lying on your side.
Water-resistant down and synthetic insulation ensure all-condition performance: The bag uses 650-fill RDS-certified Downtek insulation, which has a PFC-free hydrophobic treatment to provide an excellent warmth-to-weight ratio with weather-resistance to keep on insulating even when damp or wet. Products certified to the Responsible Down Standard (RDS) contain down or feathers from farms certified to animal welfare requirements. Strategically placed synthetic insulation provides padding and pressure relief at the knees, hips, and shoulders.
Anti-draft features for greater comfort: A cinchable hood has insulated tubing along the upper opening and collar for sealed-in warmth. The zipper also has anti-draft protection so cold air can't sneak in.

Sizing, fit, and storage

The Sidewinder 20 Degree sleeping bag is available in Small (fits up to 5'6"), Regular (fits up to 6') and Long (fits up to 6'6") sizes. The Small has a shoulder girth of 58 inches and tapers down to 33 inches at the footbox. The Regular has a shoulder girth of 60 inches and tapers down to 36 inches at the footbox. The Long has a shoulder girth of 64 inches and tapers down to 49 inches at the footbox. A stuff sack and a separate storage sack are included.

Technical Specs

Best Use

Backpacking, Camping

En Comfort Rating

30 Degrees F

En Lower Limit Rating

19 Degrees F

Fill Material

Primary: 650 fill Downtek with bluesign approved water-repellent chemistry
Secondary: FireLine ECO Synthetic Insulation, 100% post-consumer recycled polyester

Fits To Girth

Small: 58"
Regular: 61"
Long: 65"

Fits To Length

Small: 5' 6"
Regular: 6' 0"
Long: 6' 6"

Temperature Rating

20 degrees F

Insulation Type

Hybrid

Item Weight

Small: 2 lbs 4 oz
Regular: 2 lbs 7 oz
Long: 2 lbs 11 oz

Other

Stuff Sack and Storage Sack Included

Warranty

Limited Lifetime

Packed Size

Small: 9.5" x 8"
Regular: 10" x 8"
Long: 10.5" x 8.5"

Shell Material

Recycled polyester ripstop with a DWR

Liner Material

Recycled polyester taffeta with a DWR

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