Sea to Summit Spark Sleeping Bag
Best ultralight insulation for minimalist backpackers seeking maximum warmth.
This is the ultimate choice for ounce-counters who refuse to sacrifice warmth. By prioritizing a precision-engineered, women-specific fit and high-loft down, it eliminates unnecessary bulk. You trade a bit of interior wiggle room for a highly efficient, thermally optimized cocoon that feels practically weightless in your pack.
$278.00
at
Past Outdoors
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Who it's for
- Ultralight backpackers prioritizing minimal pack weight and space
- Serious trekkers seeking high-performance insulation for cold mountain nights
- Fast-and-light hikers needing to maximize internal gear storage
Who should skip it
- Restless sleepers who feel claustrophobic in tight-fitting technical gear
- Rough-and-tumble campers who need high-durability gear for demanding terrain
- Warm sleepers who need full-length zippers for temperature regulation
Performance breakdown
Warmth-to-Weight Ratio
High-loft 850+ down delivers incredible thermal efficiency at minimal pack weight.
Packability
Compresses down to a tiny footprint, saving precious space in your pack.
Ergonomic Fit
Women-specific shaping eliminates cold spots while allowing for natural movement.
Material Durability
Ultralight 10D fabrics require careful handling to avoid tears in rugged terrain.
Weather Resistance
PFC-free DWR treatment handles light moisture well but isn't fully waterproof.
Zipper Performance
YKK hardware operates smoothly, minimizing frustrating snags during late-night exits.
Key Specs
Insulation Type
850+ fill power goose down
Shell Material
10D Nylon
Lining Material
10D Nylon
Temperature Rating
7C/45F to -9C/15F
Weight
382g to 1kg
Max User Height
185 cm
Compressed Volume
3L to 13L
Zipper
YKK #5
Know before you buy
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Ask Metto anything about the Sea to Summit Spark Sleeping Bag before you decide.