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Designed for side sleepers, the Big Agnes Sidewinder -18C Down Sleeping Bag delivers warmth, comfort, and freedom of movement in cold conditions. Built with a body-mapped design, it moves naturally with you through the night, reducing pressure points and improving overall sleep quality on backcountry adventures.
A combination of 650 fill DownTek insulation and strategically placed synthetic insulation provides warmth where you need it most, while adding cushioning at the hips, knees, and shoulders. The ergonomic profile and footbox enhance thermal efficiency in side-sleeping positions, while the close-fitting hood and draft protection features help retain heat. Constructed with recycled materials and designed for reliable performance, this sleeping bag is ready for demanding conditions.
Total Weight: 3lb 7oz / 1.57kg
ISO Comfort: 18øF / -8øC
ISO Limit: 5øF / -15øC
Fill Type: 650 DownTek + FireLine ECO
Total Fill Weight: 29oz Down + 6.5oz Synthetic / 815g Down + 183g Synthetic
Compressed Bag Size: 10" x 10" / 25 x 25cm
Stuff Sack Size: 26L 10" x 21" / 26L 25 x 52cm
Max User Height: 6' / 183cm
Recommended Pad Size: Works with any pad size or style
Shoulder Girth: 61" / 155cm
Hip Girth: 55" / 140cm
Materials
Shell: Recycled polyester ripstop featuring a water-repellent finish without intentionally added PFAS chemicals
Lining: Recycled polyester taffeta featuring a water-repellent finish without intentionally added PFAS
Primary Fill: 650 fill Downtek PFC-Free repels water while maintaining insulating value, with bluesign Certified water-repellent chemistry
Body Mapped Fill: FireLine ECO Synthetic Insulation, 100% post-consumer recycled polyester, featuring low-denier fibers that are tightly woven and provide high loft, compressibility, high weight-to-warmth ratio, and durability
Explore the complete collection of Big Agnes tents, sleeping bags, and outdoor gear at Wild Earth, and upgrade your camping comfort with award-winning design....