Designed for ultralight adventures in any climate, the Spark Down Sleeping Bag balances weight, warmth, and packability. It is filled with RDS-certified 850+ fillpower goose down treated with PFAS-free Ultra-Dry Down to resist moisture and maintain loft. The 10D bluesign®-approved liner fabric is soft and breathable, while the 10D shell features a PFAS-free DWR with reinforced, water-resistant hood and footbox panels to protect against condensation.
An ergonomic mummy fit, draft tubes, and a technical hood help seal in warmth without unnecessary bulk. Full-length zip versions can be paired with Women’s Spark bags, and the QuiltLock system allows you to attach a compatible Sea to Summit quilt for extra layering when conditions drop.
Features
- RDS-certified 850+ fillpower goose down with PFAS-free Ultra-Dry Down for lasting loft and moisture resistance
- Ultralight 10D bluesign®-approved nylon liner and 10D shell with PFAS-free DWR, plus reinforced water-resistant hood and footbox panels
- Ergonomic mummy fit with a technical hood, anatomical footbox, and generous draft tubes to seal in warmth without excess weight
- Updated YKK #5 zipper with snag-free plow design for smoother operation and improved durability
- QuiltLock system allows compatible Sea to Summit quilts to attach over the bag for extra insulation in colder conditions
- Baffle construction tailored to each model: sewn-through (7°C), hybrid box/stitched (-1°C), or full box baffles for maximum warmth (-9°C, -18°C)
- Zip options vary by model: half-length for lighter packs (7°C, -1°C) or full-length side zips for versatility (-9°C, -18°C)
- Includes compression sack, large mesh storage bag, and certified down test certificate for quality assurance
- Backed by the Sea to Summit Lifetime Guarantee
Performance
Weight
Among the lightest sleeping bags in its class, starting at just 363g for the 7°C model and staying under 1.2kg even in the -18°C version.
Packability
Premium 850+ down compresses to a tiny size. Each model includes a compression sack for on-trail storage and a mesh storage bag for at-home loft recovery.
Climate
Temperature ratings span from 7°C down to -18°C, making the Spark suitable for warm-weather hikes through to high-altitude or sub-zero expeditions.
Tech specs
- Best Use
Ultralight backpacking, alpine missions, and fast-and-light adventures where every gram counts.
Comes With
40D recycled bluesign®-approved nylon compression sack, large mesh storage bag for at-home loft recovery, and a certified down test certificate.
Insulation
RDS-certified 850+ fillpower goose down with PFAS-free Ultra-Dry Down treatment for reliable loft and moisture resistance.
Shape
Streamlined mummy fit with an anatomical footbox and technical hood.
Zip Options
Durable YKK #5 zipper with snag-free plow. Half-length zips on 7°C and -1°C models for weight savings; full-length side zips on -9°C and -18°C models for versatility.
| Model | Bag Weight | Compressed Volume | Compression Sack | Fill Weight | Fits Up To Height | Temperature Rating (ISO Lower Limit) | Women’s Temp Rating (ISO Comfort) |
|---|---|---|---|---|---|---|---|
| 7°C Regular SKU: ASL041072-050101 SEA TO SUMMIT Spark Down Sleeping Bag 7C|45F - Regular (RDS) |
363g | 2.4 L | 2 L | 150 g | 185 cm | 7°C | 11°C |
| 7°C Long SKU: ASL041072-210102 SEA TO SUMMIT Spark Down Sleeping Bag 7C|45F - Long (RDS) |
387g | 2.9 L | 3 L | 172 g | 198 cm | 7°C | 11°C |
| -1°C Regular SKU: ASL041072-050103 SEA TO SUMMIT Spark Down Sleeping Bag -1C|30F - Regular (RDS) |
493g | 4.5 L | 8 L | 265 g | 185 cm | -1°C | 4°C |
| -1°C Long SKU: ASL041072-210104 SEA TO SUMMIT Spark Down Sleeping Bag -1C|30F - Long (RDS) |
536g | 5.1 L | 8 L | 305 g | 198 cm | -1°C | 4°C |
| -9°C Regular SKU: ASL041072-050105 SEA TO SUMMIT Spark Down Sleeping Bag -9C|15F - Regular (RDS) |
730g | 6.8 L | 13 L | 480 g | 185 cm | -9°C | -2°C |
| -9°C Long SKU: ASL041072-210106 SEA TO SUMMIT Spark Down Sleeping Bag -9C|15F - Long (RDS) |
786g | 7.6 L | 13 L | 540 g | 198 cm | -9°C | -2°C |
| -9°C Double SKU: ASL041072-220107 SEA TO SUMMIT Spark Down Sleeping Bag -9C|15F Double (RDS) |
1543g | 14.3 L | 20 L | 985 g | 198 cm | -9°C | -2°C |
| -18°C Regular SKU: ASL041072-050108 SEA TO SUMMIT Spark Down Sleeping Bag -18C|0F - Regular (RDS) |
1113g | 9.9 L | 20 L | 840 g | 185 cm | -18°C | -10°C |
| -18°C Long SKU: ASL041072-210109 SEA TO SUMMIT Spark Down Sleeping Bag -18C|0F - Long (RDS) |
1204g | 10.6 L | 20 L | 945 g | 198 cm | -18°C | -10°C |
| SKU | ASL041072-210106 |
|---|---|
| Barcode # | 9327868150700 |
| Brand | SEA TO SUMMIT |
| Shipping Weight | 0.7860kg |
| Shipping Width | 0.180m |
| Shipping Height | 0.275m |
| Shipping Length | 0.460m |
SEA TO SUMMIT Spark Down Sleeping Bag -9C|15F - Long (RDS)
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Designed for ultralight adventures in any climate, the Spark Down Sleeping Bag balances weight, warmth, and packability. It is filled with RDS-certified 850+ fillpower goose down treated with PFAS-free Ultra-Dry Down to resist moisture and maintain loft. The 10D bluesign®-approved liner fabric is soft and breathable, while the 10D shell features a PFAS-free DWR with reinforced, water-resistant hood and footbox panels to protect against condensation.
An ergonomic mummy fit, draft tubes, and a technical hood help seal in warmth without unnecessary bulk. Full-length zip versions can be paired with Women’s Spark bags, and the QuiltLock system allows you to attach a compatible Sea to Summit quilt for extra layering when conditions drop.
Features
- RDS-certified 850+ fillpower goose down with PFAS-free Ultra-Dry Down for lasting loft and moisture resistance
- Ultralight 10D bluesign®-approved nylon liner and 10D shell with PFAS-free DWR, plus reinforced water-resistant hood and footbox panels
- Ergonomic mummy fit with a technical hood, anatomical footbox, and generous draft tubes to seal in warmth without excess weight
- Updated YKK #5 zipper with snag-free plow design for smoother operation and improved durability
- QuiltLock system allows compatible Sea to Summit quilts to attach over the bag for extra insulation in colder conditions
- Baffle construction tailored to each model: sewn-through (7°C), hybrid box/stitched (-1°C), or full box baffles for maximum warmth (-9°C, -18°C)
- Zip options vary by model: half-length for lighter packs (7°C, -1°C) or full-length side zips for versatility (-9°C, -18°C)
- Includes compression sack, large mesh storage bag, and certified down test certificate for quality assurance
- Backed by the Sea to Summit Lifetime Guarantee
Performance
Weight
Among the lightest sleeping bags in its class, starting at just 363g for the 7°C model and staying under 1.2kg even in the -18°C version.
Packability
Premium 850+ down compresses to a tiny size. Each model includes a compression sack for on-trail storage and a mesh storage bag for at-home loft recovery.
Climate
Temperature ratings span from 7°C down to -18°C, making the Spark suitable for warm-weather hikes through to high-altitude or sub-zero expeditions.
Tech specs
- Best Use
Ultralight backpacking, alpine missions, and fast-and-light adventures where every gram counts.
Comes With
40D recycled bluesign®-approved nylon compression sack, large mesh storage bag for at-home loft recovery, and a certified down test certificate.
Insulation
RDS-certified 850+ fillpower goose down with PFAS-free Ultra-Dry Down treatment for reliable loft and moisture resistance.
Shape
Streamlined mummy fit with an anatomical footbox and technical hood.
Zip Options
Durable YKK #5 zipper with snag-free plow. Half-length zips on 7°C and -1°C models for weight savings; full-length side zips on -9°C and -18°C models for versatility.
| Model | Bag Weight | Compressed Volume | Compression Sack | Fill Weight | Fits Up To Height | Temperature Rating (ISO Lower Limit) | Women’s Temp Rating (ISO Comfort) |
|---|---|---|---|---|---|---|---|
| 7°C Regular SKU: ASL041072-050101 SEA TO SUMMIT Spark Down Sleeping Bag 7C|45F - Regular (RDS) |
363g | 2.4 L | 2 L | 150 g | 185 cm | 7°C | 11°C |
| 7°C Long SKU: ASL041072-210102 SEA TO SUMMIT Spark Down Sleeping Bag 7C|45F - Long (RDS) |
387g | 2.9 L | 3 L | 172 g | 198 cm | 7°C | 11°C |
| -1°C Regular SKU: ASL041072-050103 SEA TO SUMMIT Spark Down Sleeping Bag -1C|30F - Regular (RDS) |
493g | 4.5 L | 8 L | 265 g | 185 cm | -1°C | 4°C |
| -1°C Long SKU: ASL041072-210104 SEA TO SUMMIT Spark Down Sleeping Bag -1C|30F - Long (RDS) |
536g | 5.1 L | 8 L | 305 g | 198 cm | -1°C | 4°C |
| -9°C Regular SKU: ASL041072-050105 SEA TO SUMMIT Spark Down Sleeping Bag -9C|15F - Regular (RDS) |
730g | 6.8 L | 13 L | 480 g | 185 cm | -9°C | -2°C |
| -9°C Long SKU: ASL041072-210106 SEA TO SUMMIT Spark Down Sleeping Bag -9C|15F - Long (RDS) |
786g | 7.6 L | 13 L | 540 g | 198 cm | -9°C | -2°C |
| -9°C Double SKU: ASL041072-220107 SEA TO SUMMIT Spark Down Sleeping Bag -9C|15F Double (RDS) |
1543g | 14.3 L | 20 L | 985 g | 198 cm | -9°C | -2°C |
| -18°C Regular SKU: ASL041072-050108 SEA TO SUMMIT Spark Down Sleeping Bag -18C|0F - Regular (RDS) |
1113g | 9.9 L | 20 L | 840 g | 185 cm | -18°C | -10°C |
| -18°C Long SKU: ASL041072-210109 SEA TO SUMMIT Spark Down Sleeping Bag -18C|0F - Long (RDS) |
1204g | 10.6 L | 20 L | 945 g | 198 cm | -18°C | -10°C |
| SKU | ASL041072-210106 |
|---|---|
| Barcode # | 9327868150700 |
| Brand | SEA TO SUMMIT |
| Shipping Weight | 0.7860kg |
| Shipping Width | 0.180m |
| Shipping Height | 0.275m |
| Shipping Length | 0.460m |
