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.

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

Zipper-length trimmed for gram-saving performance:
10°C, 5°C, and -2°C have 1/3-length zippers
-8°C and -15°C have full-length side zippers
Baffle construction:
10°C and 5°C have sewn-through construction
-2°C has baffles in the torso and sewn through in the leg area
-8°C and -15°C are fully baffled
10°C , 5°C and -2°C – Contoured mummy
-8°C and -15°C – Broader mummy

Spark I (5°C) Regular Spark I (5°C) Long Spark II (-2°C) Regular Spark II (-2°C) Long Spark III (-8°C) Regular Spark III (-8°C) Long Spark IV (-15°C) Regular Spark IV (-15°C) Long Liner Regular Liner Long
Bag Series Spark 1 Spark 1 Spark 2 Spark 2 Spark 3 Spark 3 Spark 4 Spark 4 Spark 0 Spark 0
Bag Weight 340g 385g 490g 560g 665g 745g 880g 985g 225g 260g
Compressed Vol (ASTM Standard) 1.5 L 2.2 L 2.5 L 3.5 L 4.6 L 5.4 L 6.6 L 7.7 L .9 L 1.3 L
Compression Sack XXXS – 2.5L to 1L XXXS – 2.5L to 1L XXS – 3.3L to 1.3L XXS – 3.3L to 1.3L XS – 6L to 2L XS – 6L to 2L S – 10L to 3.3L S – 10L to 3.3L Stuff Sack Stuff Sack
Fill Weight 180g 205g 300g 345g 430g 485g 620g 700g 100g 115g
Fits Up To Height 183 cm 192 cm 183 cm 192 cm 183 cm 192 cm 183 cm 192 cm 183 cm 192 cm
Season Rating Warm Weather Warm Weather 2 Season 2 Season 2.5 Season 2.5 Season 3.5 Season 3.5 Season Summer or Sleeping Bag Liner Summer or Sleeping Bag Liner
Temperature Rating (EN Comfort / Lower Limit) 5ºC 5ºC -2ºC -2ºC -8ºC -8ºC -15ºC -15ºC 10ºC 10ºC
Women’s Temp Rating (EN Comfort) 9ºC 9ºC 4ºC 4ºC -2ºC -2ºC -8ºC -8ºC 14ºC 14°C
Weight 1 kg


Temperature Rating

-2°C, -8°C