Big Agnes Sidewinder SL
Best comfortable sleep for side sleepers on outdoor adventures.
A specialized sleeping bag engineered to eliminate the discomfort of side sleeping. It uses body-mapped insulation to keep you warm while allowing for natural movement throughout the night.
$83.73
In stock
at
REI Co-op
Who it's for
- Campers desiring a stable sleep setup without rolling off their pad
- Backpackers needing dependable warmth and insulation in varied, potentially damp, conditions
- Side sleepers seeking a truly comfortable and stable night's rest
Who should skip it
- Campers preferring full 360-degree insulation or no sleeping pad
- Back or stomach sleepers needing more room to move freely
- Budget-conscious adventurers looking for more affordable sleeping bag options
Performance breakdown
Side-sleeping ergonomics
The cocoon shape eliminates the restriction typical of standard mummy bags.
Damp weather performance
Synthetic insulation retains loft and warmth even when moisture levels rise.
Weight-to-warmth ratio
Solid warmth for camping, though slightly heavy for ultralight backpacking trips.
Entry and exit
Front-zip access makes getting in and out remarkably smooth and intuitive.
Fit and comfort
Women-specific tailoring removes dead space for a more efficient, cozy fit.
Feature integration
Thoughtful additions like the pillow tuck significantly improve overall sleep quality.
Key Specs
Weight
2.69 lbs
Temperature Rating
35 degrees Fahrenheit
Max User Height
72 inches
Fill Power
650 cubic inches per ounce
Insulation Type
Synthetic
Shell Material
Ripstop Nylon
Lining Material
Polyester
Sleeping Bag Shape
Mummy
Know before you buy
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