Big Agnes Sidewinder SL
Best sleeping bag for side sleepers seeking comfort and warmth.
Engineered for those who toss and turn, this bag features a unique shape that moves with you rather than restricting you. It balances warmth and weight by mapping synthetic insulation in high-pressure areas while keeping premium down where it counts most.
$157.00
In stock
at
Out and Back Outdoor
Who it's for
- Side sleepers seeking ergonomic comfort and freedom of movement
- Backpackers prioritizing low weight and compact gear
- Hikers camping in humid or unpredictable weather conditions
Who should skip it
- Back or stomach sleepers who prefer a traditional bag shape
- Budget-conscious campers looking for an entry-level sleeping bag
- Campers wanting low-maintenance, wash-and-go gear
Performance breakdown
Side-sleeping ergonomics
The specialized footbox and fit perfectly accommodate natural side-sleeping positions.
Thermal efficiency
Body-mapped insulation zones effectively trap heat exactly where you need it.
Pillow stability
The integrated Pillow Barn keeps your head support secure all night.
Zipper performance
Anti-snag locking mechanism ensures smooth entry and exit in the dark.
Moisture resistance
Water-repellent down and PFC-free finish handle damp conditions with ease.
Mobility and fit
Technical cut allows natural movement without feeling restricted or claustrophobic.
Key Specs
Bag Weight
Long: 2lb 8oz / 1.13kg
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
Compressed Bag Size
Long: 7.5" x 8" / 19 x 20cm
Fill Weight
Long: 21oz / 604g
Lining
polyester taffeta featuring a PFC-free water repellent finish
Long
fits up to 6'6" / 198cm
Primary Fill
650 fill DownTek repels water while maintaining insulating value - bluesign Certified PFC free water repellent chemistry
Shell
nylon ripstop featuring a PFC-free water repellent finish
Still have a question?
Ask Metto anything about the Big Agnes Sidewinder SL before you decide.
