The Big Agnes Sidewinder Super Light (650 DownTek) is the 20-degree side-sleeper sleeping bag designed for backpackers who sleep on their side and hate fighting a mummy bag all night. Current price: $96.29, down from $329.95 — a massive 71% discount. Stack coupon SAVE15 for extra savings and buy online now with free shipping over $45.
Warmth & Zipper: Is It Warm and Does the Zipper Snag?
The 20°F rating is a temperature limit rating, warmed by 650 fill power DownTek water-repellent goose down plus FireLine ECO synthetic insulation in mapped zones. The wrap-around zipper is paired with an anti-snag design so it glides smoothly as you rotate inside the cocoon-style cut.
Specifications
- Temperature rating: 20°F (limit rating)
- Insulation: PFC-free, bluesign-approved 650 DownTek + FireLine ECO synthetic
- Shell: GRS-certified 100% recycled polyester ripstop, PFAS-free water-repellent finish
- Small model: fits up to 72", weighs 2 lb 7 oz, packs to 14L (8" x 17.5")
Side-Sleeper Construction
The cocoon design, wrap-around zipper, and integrated "Pillow Barn" keep your pillow in place as you turn, while thermal mapping adds insulation at the hips and feet — the pressure points side sleepers feel most.
Sustainable Materials
Recycled ripstop shell, taffeta lining, PFAS-free DWR, and bluesign-approved down make this one of the most eco-conscious technical bags available.
Comparisons & Alternatives
Standard mummy bags bunch and compress when you side sleep; the Sidewinder eliminates that problem by design. Against similarly specified 20°F down bags, the Sidewinder's side-sleeper geometry and DownTek moisture resistance justify the upgrade — especially at this sale price.
Price & Deal Value
Save $233.66 off the $329.95 compare-at price at $96.29. Coupon SAVE15 takes another 15% off. Free shipping over $45. Buy now — this discount won't last.
Pair withBig Agnes Skyline UL Camp Chair Insulated Cover$24.98
