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Highlights
Second Summit: Lets give gear a second chance. Shop our expertly inspected, pre-owned gear delivered to you in like new condition and protected by the Sea to Summit Guarantee.
Best Use: Ultralight Backpacking
Performance: Cold Climate
Weight: 2lb 7.3oz | 1113g
Compressed Volume: 9.9L
Lower Temp Rating: 0°F | -18°C
About The Product
If you're counting grams, but still count on a great night's sleep, the Spark may be the right bag for you.
Filled with RDS-certified 850+ fillpower goose down treated with a non-PFAS Ultra-Dry Down treatment, the Spark is constructed with a technical hood and zipper draft tube to retain warmth. Comfort comes from a super-breathable 10 Denier liner fabric, while a 10D shell with a non-PFAS DWR plus a highly water repellent hood and footbox fabric shed wind and condensation.
The full-length zipper models can be zipped to an equivalent Women's Spark for comfort that couples can share
Product Features
- RDS-certified, 850+ fillpower goose down with a non-PFAS Ultra-Dry Down treatment for maximum thermal performance
- Ultralight, breathable 10D nylon liner and a 10D shell with non-PFAS DWR keeps the hood and footbox highly water resistant
- Technical hood, anatomical footbox and an ergonomic mummy shape - ultralight doesn't have to mean ultratight
Shipping & Returns
Free US Shipping on Orders $50+
Easy 60-Day Returns
For more details, please check out our Help Center.
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Sleeping Bag ISO Temperature Ratings Explained
Sea to Summit tests its sleeping bags for their temperature rating using the ISO 23537 test protocol. This test gives two key ratings: Lower Limit and Comfort Rating.
Lower Limit: The lowest temperature at which a man should stay warm.
Comfort Rating: The lowest temperature at which a woman should stay warm.
Sea to Summit Women’s-specific sleeping bags are listed using the Comfort Rating. Unisex bags are listed using the Lower Rating. For example, if the bag is rated at Lower Limit of 14°F | -10°C and Comfort rating of 27°F | -3°C, it should keep a woman warm down to 27°F | -3°C and a man warm down to 14°F | -10°C, if they are wearing warm clothes and using a good sleeping pad.
Remember: These ratings are just guidelines. Movement, weather, and your gear setup can all affect how warm you actually stay.
Pro Tip: Think of your sleeping bag, pad, and liner as a system. If you expect 28°F | -2°C weather, choose a sleeping bag rated for 23°F | -5°C, use a sleeping pad with an R-Value of 3 or more, and add a liner for extra warmth.
Spark Down Sleeping Bag (-18°C - 7°C) -18°C / Regular
- RDS-certified, 850+ fillpower goose down with a non-PFAS Ultra-Dry Down treatment for maximum thermal performance
- Ultralight, breathable 10D nylon liner and a 10D shell with non-PFAS DWR keeps the hood and footbox highly water resistant
- Technical hood, anatomical footbox and an ergonomic mummy shape - ultralight doesn't have to mean ultratight
- YKK #5 zippers with zipper plough provide reliable, snag-free operation
- Baffle construction specific for each use: Sewn through for lighter weight (7°C|45°F), 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)
- Zipper length specific for each use: half-length (7°C|45°F and -1°C | 30°F) for ultralight packability; full-length side zip (-9°C | 15°F and -18°C | 0°F)
- 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, 850+ non-PFAS Ultra-Dry Down
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ShapeMummy
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Zip OptionsYKK #5 zippers with snag free zipper plow
| -18°C Regular | -18°C Long | -9°C Regular | -9°C Long | -9°C Double | -1°C Regular | -1°C Long | 7°C Regular | 7°C Long | |
|---|---|---|---|---|---|---|---|---|---|
| Bag Weight | 2lbs 7.3oz 1113g | 2lbs 10.5oz 1204g | 1lb 9.7oz 730g | 1lb 11.7oz 786g | 3lbs 6.4oz 1543g | 1lb 1.4oz 493g | 1lb 2.9oz 536g | 12.8oz 363g | 13.7oz 387g |
| Compressed Volume | 9.9 L9.9 L | 10.6 L10.6 L | 6.8 L6.8 L | 7.6 L7.6 L | 14.3 L14.3 L | 4.5 L4.5 L | 5.1 L5.1 L | 2.4 L2.4 L | 2.9 L2.9 L |
| Compression Sack | 20 L20 L | 20 L20 L | 13 L13 L | 13 L13 L | 20 L20 L | 8 L8 L | 8 L8 L | 2 L2 L | 3 L3 L |
| Fill Weight | 29.6 oz 840 g | 33.3 oz 945 g | 16.9 oz 480 g | 19.0 oz 540 g | 34.7 oz 985 g | 9.3 oz 265 g | 10.8 oz 305 g | 5.3 oz 150 g | 6.1 oz 172 g |
| Fits Up To Height | 6 ft 1 in6 ft 1 in | 6 ft 6 in 198 cm | 6 ft 1 in 185 cm | 6 ft 6 in 198 cm | 6 ft 6 in 198 cm | 6 ft 1 in 185 cm | 6 ft 6 in 198 cm | 6 ft 1 in 185 cm | 6 ft 6 in 198 cm |
| Temperature Rating (ISO Lower Limit) | 0°F -18°C | 0°F -18°C | 15°F -9°C | 15°F -9°C | 15°F -9°C | 30°F -1°C | 30°F -1°C | 45°F 7°C | 45°F 7°C |
| Women's Temp Rating (ISO Comfort) | 14°F -10°C | 14°F -10°C | 29°F -2°C | 29°F -2°C | 29°F -2°C | 39°F 4°C | 39°F 4°C | 51°F 11°C | 51°F 11°C |
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