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Sea to Summit Spark SpIII Down Sleeping Bag (-8C)

Sea to Summit Spark SpIII Down Sleeping Bag (-8C)
$619.00 - $649.00
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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 for the designed end-use.

Ultralight does not mean ultra-tight: The Spark mummy sleeping bags are snug but still have adequate girth for the performance-oriented backcountry user.

Bag Weight : 665g / 1.47lbs
Fill : 850+ Fill Power Ultra Dry RDS Goose Down
Fill Weight: 430g / 15.2oz

ULTRA-DRY Down 850+ Loft 90% Down Cluster Premium Goose Down certified Responsible Down Standard (RDS)

10D shell and 7D liner materials help to achieve the incredible lightweight and compact packed size

Includes lightweight Ultra-Sil™ compression bag and storage cell

-8C/18°F Spark III features full-length side zippers

Baffle construction, -8C/18°F Spark III is fully baffled

Recommended Use

Ultralight Backpacking


3 Seasons

Temperature Rating


Comfort Limit


Lower Limit




Insulation Type

850+ Fill Power Ultra Dry


RDS Goose Down

Bag Weight

Regular: 665g / 1.47lbs


Long: 745g / 1.64lbs

Fill Weight

Regular: 430g / 15.2oz


Long: 485g / 17.1oz

Fits to User Height

Regular: 183cm / 6ft


Long: 192cm / 6’4”

Girth – Shoulder

Regular: 147cm / 58”


Long: 152cm / 60”

Girth - Hip

Regular: 126cm / 50”


Long: 132cm / 52”

Girth - Foot

Regular: 88cm / 35”


Long: 94cm / 38”

Compressed Volume

Regular – 4.6L


Long – 5.4L

Fabric – Shell

Ultralight 10D Nylon Shell

Fabric – Lining


Comes With

Ultra-Sil Compression Sack


Storage Cell


Sea to Summit Spark Series Sleeping Bags

Part Numbers

Option UPC MPN Store SKU
Regular 9327868095001 S2131 SLE625486610
Long 9327868095018 S2132 SLE63790460

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