Big Agnes

Sidewinder SL Sleeping Bag: 20F Down - Women's

What Our Gearhead® Experts Are Saying:

"I sleep on my side and always struggled with traditional mummy bags until I found the Sidewinder SL 20. This size fits me perfectly—no extra bulk or dead space—and the way it hugs and moves with me makes a huge difference on colder nights."

Just because we pack smaller doesn’t mean we compromise on comfort. The Sidewinder SL 20 Sleeping Bag is thoughtfully designed to match side-sleeping patterns with a shape that supports natural movement, all in a compact size built for efficient warmth and minimal wasted space. With a comfort rating tuned for shoulder-season nights, it's ideal for cool mountain camps or early spring trips where weight matters and comfort counts.

The hybrid insulation system combines lightweight 650-fill DownTek™ with body-mapped synthetic insulation in key pressure areas—like the hips, shoulders, and knees—giving us the warmth we need exactly where we need it. The close-fitting hood seals in heat, and the recycled polyester shell sheds light moisture without relying on harmful PFAS. Built for smaller frames without cutting corners, this bag keeps us warm, dry, and well-rested wherever we roll out for the night.