Sea to Summit Spark Pro Sleeping Bag
Best ultralight insulation for dedicated backcountry hikers in cold climates.
Designed for gram-counters who refuse to sacrifice comfort, this ultralight bag balances thermal efficiency with minimal pack weight. It utilizes high-loft down and breathable fabrics to create a cozy, protective environment that disappears into a pack.
$549.00
at
Sea to Summit
More Spark options
Who it's for
- Ultralight backpackers prioritizing minimal pack weight without sacrificing warmth
- Active sleepers who need adjustable airflow to prevent overheating
- Alpine climbers and damp-climate hikers requiring reliable insulation performance
Who should skip it
- Budget-conscious campers seeking a more affordable entry-level sleep system
- Rugged adventurers who frequently sleep directly on rough ground
- Side sleepers or restless individuals who need significant interior space
Performance breakdown
Weight Efficiency
Featherweight construction makes this nearly imperceptible in a loaded backcountry pack.
Thermal Versatility
Multi-zipper system adapts effortlessly from freezing nights to balmy summer evenings.
Insulation Quality
Premium 900-fill down offers industry-leading warmth-to-weight performance for serious hikers.
Packability
Compresses down to a tiny footprint, saving precious space for other essentials.
Moisture Management
Treated down maintains loft reliably even when humidity levels spike overnight.
Ergonomic Comfort
Mummy cut balances thermal efficiency with enough room to shift comfortably.
Key Specs
Weight
1.36 lbs
Temperature Rating
30 degrees Fahrenheit
Fill Power
900 cubic inches per ounce
Compressed Volume
5.3 liters
Shell Material
10D Nylon
Lining Material
10D Nylon
Insulation Type
Down
Zipper Location
Side, Footbox, Shoulder
Water Resistant
Yes
Season Rating
2 Season
Know before you buy
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