Sea to Summit Altitude Sleeping Bag
Best versatile cold weather sleep system for side sleepers.
This bag excels at balancing thermal efficiency with ventilation, making it a versatile choice for three-season backpacking. Its women-specific geometry prevents cold spots while allowing for natural movement, and the clever zipper system offers multiple ways to regulate temperature throughout the night.
$449.00
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Who it's for
- Campers seeking adaptable comfort for varying mountain temperatures
- Women who prefer a non-restrictive fit without sacrificing thermal efficiency
- Backpackers prioritizing a high warmth-to-weight ratio for cold nights
Who should skip it
- Ultralight hikers with limited space in their packs
- Budget-conscious campers looking for an affordable occasional-use sleeping bag
- Ounce-counting enthusiasts who prioritize absolute minimum weight over comfort features
Performance breakdown
Thermal Efficiency
Body-mapped insulation effectively eliminates cold spots for consistent, reliable warmth.
Packability
Compresses down to a compact 8.1 liters for effortless backpack storage.
Ventilation Versatility
The Free-flow zipper system offers unmatched temperature control for changing conditions.
Ergonomic Fit
Women-specific shaping provides ample room for natural movement without sacrificing heat.
Weight-to-Warmth Ratio
Lightweight materials deliver substantial insulation without adding unnecessary bulk.
Foot-Box Comfort
Thermolite insulation in the foot section ensures immediate, cozy warmth.
Key Specs
Weight
2.82 lbs
Temperature Rating
15 degrees Fahrenheit
Compressed Volume
8.1 liters
Max User Height
67 inches
Insulation Type
750+ Loft Down and Thermolite
Shell Material
20D Nylon
Sleeping Bag Shape
Women's specific
Season Rating
3 Season
Zipper Location
Side and Foot
Water Resistant
Yes
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