Highlights
BEST USE: Ultralight adventures
PERFORMANCE: Small pack size
WEIGHT: 1204g
Description
The Spark Ultralight Mummy Sleeping Bag Series spans everything from an ultralight down-filled liner, to a mid-winter fast-and-light sleeping bag. Each model uses premium materials and no-frills design to provide ...
Product Details
- 850+ FILL Power, RDS-certified, Goose Down with Ultra Dry Down treatment for improved water resistance in damp conditions
- 10-Denier Nylon shell and lining. 10-Denier Nylon waterproof-breathable hood and footbox.
- Mummy Fit: Fitted cut with generous footbox and technical hood, to maximise thermal efficiency and minimise bulk and weight.
- Spark 7C/45F & 1C/30F Primary zip - 1/2 length #5 with zip-plow and two sliders. Spark -9C/15F & -18C/0F Primary zip - 3/4 length #5 with zip-plow and two sliders.
- Vertical chest baffles, horizontal baffles lower half and base. SPARK 7C sewn through quilted construction throughout. SPARK -1C/30Fbox wall baffles top half of bag and sewn through quilted construction lower half. SPARK -9C & -18C box wall baffle construction throughout.
- Spark 7C, -1C & -9C Standard front draft collar. SPARK -18C Double draft collars
- Spark 7 & -1 can't be paired. Spark -9 & -18: Pairs with Women's Sea to Summit bags.
- QuiltLock System integrates with StS quilts
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Description
The Spark Ultralight Mummy Sleeping Bag Series spans everything from an ultralight down-filled liner, to a mid-winter fast-and-light sleeping bag. Each model uses premium materials and no-frills design to provide cutting-edge performance.
Ultralight does not mean ultra-tight: The Spark mummy sleeping bags are snug but still have adequate wiggle room for the performance-oriented, backcountry user.
- 850+ FILL Power, RDS-certified, Goose Down with Ultra Dry Down treatment for improved water resistance in damp conditions
- 10-Denier Nylon shell and lining. 10-Denier Nylon waterproof-breathable hood and footbox.
- Mummy Fit: Fitted cut with generous footbox and technical hood, to maximise thermal efficiency and minimise bulk and weight.
- Spark 7C/45F & 1C/30F Primary zip - 1/2 length #5 with zip-plow and two sliders. Spark -9C/15F & -18C/0F Primary zip - 3/4 length #5 with zip-plow and two sliders.
- Vertical chest baffles, horizontal baffles lower half and base. SPARK 7C sewn through quilted construction throughout. SPARK -1C/30Fbox wall baffles top half of bag and sewn through quilted construction lower half. SPARK -9C & -18C box wall baffle construction throughout.
- Spark 7C, -1C & -9C Standard front draft collar. SPARK -18C Double draft collars
- Spark 7 & -1 can't be paired. Spark -9 & -18: Pairs with Women's Sea to Summit bags.
- QuiltLock System integrates with StS quilts
Design Details
TECHNICAL FEATURES
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.
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.
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
Ultra-Dry Down is a non-PFC treatment hydrophobic treatment applied to the down during down processing. It is not a coating (which would reduce the ability of the down to loft), it comprises of very small particles of a polymer that cause the down clusters / feathers to repel water. Hydrophobic down is not waterproof; but it absorbs less water than untreated down and dries much more quickly.
Ultra-Dry Down does not affect the loft or lifespan of the down, or its breathability. The treatment will last through at least 20 washings.
Tech specs
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Best UseUltralight Backpacking
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Comes WithUltra-Sil compression bag and storage cell
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InsulationUltra-Dry Goose Down 850+ Loft
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Material(s)10-Denier Nylon shell and lining. 10-Denier Nylon waterproof-breathable hood and footbox.
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ShapeMummy Fit: Fitted cut with generous footbox and technical hood
| 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 | |
|---|---|---|---|---|---|---|---|---|---|
| Bag Series | SparkSpark | SparkSpark | SparkSpark | SparkSpark | SparkSpark | SparkSpark | SparkSpark | SparkSpark | SparkSpark |
| Bag Weight | 363g363g | 387g387g | 510 g510 g | 536g536g | 730g730g | 786g786g | 1543g1543g | 1113g1113g | 1204g1204g |
| Compression Sack | 2L 2L | 3L3L | 8L8L | 8L8L | 13L 13L | 13L 13L | 20L20L | 20L20L | 20L20L |
| Fill Weight | 150g150g | 170g170g | 265g265g | 305g305g | 480g480g | 540g540g | 985g985g | 840g840g | 945g945g |
| Fits Up To Height | 185 cm185 cm | 198 cm198 cm | 185 cm185 cm | 198 cm198 cm | 185 cm185 cm | 198 cm198 cm | 198 cm198 cm | 185 cm185 cm | 198 cm198 cm |
| Season Rating | 1 Season1 Season | 1 Season1 Season | 2.5 Season2.5 Season | 2.5 Season2.5 Season | 3.5 Season3.5 Season | 3.5 Season3.5 Season | 3.5 Season3.5 Season | 4 Season4 Season | 4 Season4 Season |
| Temperature Rating ( EN Lower Limit) | 7ºC7ºC | 7ºC7ºC | -1ºC-1ºC | -1ºC-1ºC | -9ºC-9ºC | -9ºC-9ºC | -9ºC-9ºC | -18ºC-18ºC | -18ºC-18ºC |
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