Big Agnes Sidewinder SL 20 Sleeping Bag – Women's Regular, 650 DownTek

Overview

The Big Agnes Sidewinder SL 20 Sleeping Bag for Women is built with side sleepers in mind. It follows the natural contours of a resting body and uses body mapped insulation to add warmth where it matters while reducing pressure points as you move from side to side through the night. The combination of down and synthetic fill delivers a balanced warmth profile without feeling bulky in a backpacking sack.

Designed for side sleepers

• Engineered from the ground up for people who sleep on their sides with a technical fit that moves with you as you roll
• Body mapped insulation places loft where it counts and uses synthetic insulation in the hips and feet to ease common pressure points

Warmth and fit that feel natural

The footbox is thermally optimized for side sleeping and the jacket style hood keeps insulation close to the body without sacrificing mobility. A draft tube along the hood seals in heat to help you stay cozy through cool nights.

Comfort features you can count on

• Pillow Barn pocket made of stretch mesh holds your pillow in place with easy access from either side for quick adjustments
• Smooth zipper with anti snag locking mechanism and no draft zipper garage helps the bag glide open and closed while you stay on your side
• Exterior loops support hang drying and simple storage when you are back from the trail

Insulation and materials

Primary fill is 650 fill DownTek that repels water while preserving loft and warmth. The DownTek finish is bluesign Certified PFAS free. Body mapped fill adds FireLine ECO synthetic insulation using 100 percent post consumer recycled polyester fibers for durable loft in critical zones.

Durability, care, and warranty

Includes a storage sack and a stuff sack for compact packing, plus exterior loops for easy air drying. The Sidewinder SL carries a lifetime warranty, reflecting its design for frequent use across adventures.

Specs and sizing

This is a Regular size built for campers up to 5 ft 10 in (165 cm). The bag weighs about 2 lb 10 oz and packs down to roughly 7.5 by 8 inches. Girth measurements help gauge space at the shoulders, hips, and feet to reduce cold spots and maximize comfort.

Who it suits

Ideal for women who value a side sleeping oriented design, warmth where it counts, and a compact pack that stays ready for the next trip. It blends comfort with practical features you can rely on during varied camping conditions.