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Highlights
BEST USE: Ultralight Backpacking
PERFORMANCE: Warm Climate
WEIGHT: 12.8oz | 363g
COMPRESSED VOLUME: 2.4L
LOWER TEMP RATING: 45°F | 7°C
Description
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 treatme...
Product Details
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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)
$599.00
Description
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
Design Details
Technical Features
850+ LOFT ULTRA-DRY DOWN
850+ LOFT ULTRA-DRY DOWN
The second highest-lofting down used in any of Sea to Summit’s sleeping bags or quilts. 850+ Fill Power indicates that one ounce (30g) of down will re-expand to over 850 cubic inches after compression. Higher loft means that less down can be used to achieve the same temperature rating – important for performance sleeping bags. The loft and down quality/composition are independently tested by the International Down and Feather Laboratory (IDFL) – a copy of the certification is supplied with every Sea to Summit sleeping bag. The down is responsibly sourced and RDS certified and treated with our non-PFC Ultra-Dry Down™ treatment.
QUILTLOCK SYSTEM
QUILTLOCK SYSTEM
The QuiltLock™ system uses the snap locks located at the shoulder and foot end of Sea to Summit sleeping bags plus the quilt footbox / quilt straps to secure a quilt to the sleeping bag. This adds thermal performance and versatility to your sleep system: your integrated quilt now works for ultralight summer adventures and turns your three-season bag into a four-season sleep system.
RESPONSIBLE DOWN STANDARD (RDS)
RESPONSIBLE DOWN STANDARD (RDS)
100% of the down used in our sleeping bags and quilts is independently certified to the Responsible Down Standard (RDS). The RDS certifies down against animal welfare requirements and tracks it from the source to the final product. The purchase of RDS certified products demonstrates demand for better animal welfare practices in the down and feather supply chain. Sea to Summit is certified to the RDS. To learn more about RDS visit https://textileexchange.org/standards/responsible-down/
Non-PFAS
Non-PFAS
Sea to Summit sleeping bag fabrics and insulation are made without PFAS compounds. The non-PFAS DWR finish on the shell helps prevent the insulation from becoming damp if the bag comes into contact with mositure, such as tent wall condensation.
Ultra-Dry Down is a non-PFAS hydrophobic treatment that absorbs less moisture and dries more quickly. It does not affect the 'breathability' or the lifespan of the down and lasts through at least 20 washings. The down used in our sleeping bags is responsibly sourced.
Sea to Summit Dry Bags, Stuff Sacks and Compression Bags use a non-PFAS Durable Water Repellent finish to help shed water. Big River bags use a non-PFAS PU coating.
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
| 7°C Regular | 7°C Long | -1°C Regular | -1°C Long | -9°C Regular | -9°C Long | -9°C Double | -18°C Regular | -18°C Long |
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Frequently Asked questions
Can I open a Spark flat for use as a quilt?
No - the ultralight Spark does not have a footbox zipper. For this feature, see the Spark Pro or Ascent sleeping bags
How much room is there in a Spark?
The Spark is designed to be ultralight, so the fit is a little more snug than a comfort-sleeping bag like the Ascent. But - it is still cut to provide room to move.
Can two Sparks be zipped together?
Any of the Spark/Women's Spark models with full-length zippers can be zipped together
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