Spark Pro Down Sleeping Bag
BEST USE: Ultralight Backpacking
PERFORMANCE: 3 Season
WEIGHT: 1lb 11.7oz | 784g
COMPRESSED VOLUME: 7L
LOWER TEMP RATING: 15°F | -9°C
- RDS-certified, 900+ fillpower goose down with a non-PFAS Ultra-Dry Down treatment for maximum thermal performance
- Featherweight 10D nylon shell with non-PFAS DWR, and a highly breathable 10D nylon liner for enhanced comfort
- Technical hood, anatomical footbox and an ergonomic mummy shape - ultralight doesn't have to mean ultratight
The Spark Pro has been optimized for comfort, versatility and light weight. Our highest-lofting down - 900+ fillpower RDS-certified goose down with a non-PFAS Ultra-Dry Down treatment - is wrapped in extremely breathable 10D fabrics. The Free-Flow Zip system ensures maximum ventilation and the flexibility to open the bag flat as a quilt. Zip a Spark Pro to a Women's Spark and share the comfort with your companion.

DESCRIPTION
The Spark Pro has been optimized for comfort, versatility and light weight. Our highest-lofting down - 900+ fillpower RDS-certified goose down with a non-PFAS Ultra-Dry Down treatment - is wrapped in extremely breathable 10D fabrics. The Free-Flow Zip system ensures maximum ventilation and the flexibility to open the bag flat as a quilt. Zip a Spark Pro to a Women's Spark and share the comfort with your companion.
Features
- RDS-certified, 900+ fillpower goose down with a non-PFAS Ultra-Dry Down treatment for maximum thermal performance
- Featherweight 10D nylon shell with non-PFAS DWR, and a highly breathable 10D nylon liner for enhanced comfort
- Technical hood, anatomical footbox and an ergonomic mummy shape - ultralight doesn't have to mean ultratight
- Free-Flow Zip System: YKK #5 side zipper with zipper plow for reliable, snag-free operation. YKK #3 footbox and shoulder zipper for minimal additional weight
- Baffle construction specific for each use: Hybrid box baffles in torso/sewn through in leg area (-1°C|30°F) or full box baffles for maximum warmth (-9°C|15°F)
- Front draft collar is fitted around the neck and oversized at the shoulders to retain warmth
- Sea to Summit Guarantee is offered for the Lifetime of this product
TECH SPECS
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Best UseUltralight Backpacking
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Comes With40D recycled, bluesign APPROVED nylon compression bag
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InsulationRDS certified, 900+ non-PFAS Ultra-Dry Down
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ShapeMummy
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Zip OptionsFree-Flow zipper system
| -1°C Regular | -1°C Long | -9°C Regular | -9°C Long | |
|---|---|---|---|---|
| Bag Weight | 619g | 672g | 784g | 861g |
| Compressed Volume | 5.3 L | 5.5 L | 7.0 L | 7.9 L |
| Compression Sack | 8 L | 8 L | 13 L | 13 L |
| Fill Weight | 310 g | 356 g | 480 g | 550 g |
| Fits Up To Height | 185 cm | 198 cm | 185 cm | 198 cm |
| Temperature Rating (ISO Lower Limit) | -1°C | -1°C | -9°C | -9°C |
| Women's Temp Rating (ISO Comfort) | 3°C | 3°C | -3°C | -3°C |
TECHNICAL FEATURES
Frequently Asked questions
Can two Spark Pros be zipped together?
The Spark Pro is only available with a left zip, but can be zipped to other STS Women's sleeping bags
Is the Spark Pro available as a women's model?
We don't currently offer a women's-specific Spark Pro. The unisex model works for female end-users (who should use the Comfort rating for orientation)
What's the difference between the Spark and the Spark Pro?
The Spark Pro has a footbox zipper and a short right-side zipper (great ventilation, open-flat as a quilt, sit up with arms extended from the bag)