Sea to Summit Spark Sleeping Bag
Best ultralight insulation for minimalist summer backpackers and speed hikers.
An ultralight solution for backpackers who need to shed weight without compromising on warmth. It balances a minimalist design with high-quality insulation, making it perfect for fast-paced trips where every gram matters.
$349.00
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Who it's for
- Ultralight backpackers prioritizing the lowest possible base weight
- Fast-and-light hikers with limited internal pack volume
- Summer campers frequently facing humid or misty environments
Who should skip it
- Three-season trekkers who encounter freezing temperatures overnight
- Restless sleepers who need space to toss and turn
- Rugged adventurers who are hard on their outdoor gear
Performance breakdown
Weight efficiency
At under a pound, it sets the standard for ultralight backpacking.
Packability
Compresses down to a tiny footprint, freeing up crucial pack space.
Thermal regulation
High-loft down provides impressive warmth for such a minimalist design.
Moisture resistance
Treated down maintains loft and performance even in damp, humid environments.
Build durability
Ultra-thin fabrics require careful handling to avoid tears in the backcountry.
Ventilation versatility
Full-length zipper allows for easy temperature control during warmer nights.
Key Specs
Shape
Mummy
Temperature Rating
45 degrees Fahrenheit
Insulation Type
Down
Fill Power
850 cubic inches per ounce
Weight
0.8 lbs
Shell Material
10-Denier nylon
Zipper Location
Left
Water Resistant
Yes
Compressed Volume
2.4 liters
Max User Height
72 inches
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