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Best Use: Ultralight Backpacking
Performance: Summer or Sleeping Bag Liner
Weight: 9.2oz | 260g
Compressed Volume: 1.3 liters
Lower Temp Rating: 50ºF | 10ºC
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 ...
Product Details
- 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
Find Locally
The EN Rating scale is a scientific test to determine the warmth of a sleeping bag. The test produces a Lower rating (for male sleepers) and a Comfort rating (for female sleepers). Both are listed in the features table on the product page.
A unisex sleeping bag with a Lower limit of 14ºF means a man should be comfortable down to air temperatures of 14ºF. The same bag will also have a Comfort limit, in the realm of 27°F, so a woman would be comfortable down to an air temperature of 27ºF. These ratings require a sleeping mat with an R-Value appropriate for expected ground temperatures – without this, the sleeping bag itself is unlikely to keep the sleeper warm enough.
A variety of factors impact sleeping bag warmth - the above temperatures are merely guidelines, not guarantees. It’s important to think of a sleeping bag, an appropriately insulating sleeping pad and a liner as a sleep system. For example - if you plan on sleeping in nighttime air temperatures of 27ºF / -3°C, choose a bag with a gender-appropriate rating of 23°F / -5°C, plus a sleeping mat with an R-Value of 2.5 to 3, and consider a Reactor thermal liner.

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.
- 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:
- 50°F, 40°F, and 28°F have 1/3-length zippers
- 18°F and 5°F have full-length side zippers that can be coupled to a Flame sleeping bag with a full-length zipper
- Baffle construction:
- 50°F and 40°F have sewn-through construction
- 28°F has baffles in the torso and sewn through in the leg area
- 18°F and 5°F are fully baffled
- Shape:
- 50°F , 40°F and 28°F - Contoured mummy
- 18°F and 5°F - Broader mummy
- T3 - Platinum Award
- Tripsavvy's Pick - Best Overall
- Live for the Outdoors Buyer's Guide - Best 3 Season Sleeping Bag
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 Down 850+ Loft
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ShapeMummy
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Shell FabricUltralight 10D Nylon Shell
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Zip OptionsSpark 0-II: Left-side #3 YKK zipper; Spark III-IV: #5 YKK
40°F Regular | 40°F Long | 28°F Regular | 28°F Long | 18°F Regular | 5°F Long | 5°F Regular | Liner Long | Liner Regular | |
---|---|---|---|---|---|---|---|---|---|
Bag Series | Spark 1Spark 1 | Spark 1Spark 1 | Spark 2Spark 2 | Spark 2Spark 2 | Spark 3Spark 3 | Spark 4Spark 4 | Spark 4Spark 4 | Spark 0Spark 0 | Spark 0Spark 0 |
Bag Weight | 12oz 340g | 13.6oz 385g | 1lb 1.3oz 490g | 1lb 3.8oz 560g | 1 lb 7.5oz 665g | 2lbs 2.7oz 985g | 1lb 15oz 880g | 9.2oz 260g | 7.9oz 225g |
Compressed Vol (ASTM Standard) | 1.5 L1.5 L | 2.2 L2.2 L | 2.5 L2.5 L | 3.5 L3.5 L | 4.6 L4.6 L | 7.7 L7.7 L | 6.6 L6.6 L | 1.3 L1.3 L | .9 L.9 L |
Compression Sack | XXXS - 2.5L to 1LXXXS - 2.5L to 1L | XXXS - 2.5L to 1LXXXS - 2.5L to 1L | XXS - 3.3L to 1.3LXXS - 3.3L to 1.3L | XXS - 3.3L to 1.3LXXS - 3.3L to 1.3L | XS - 6L to 2LXS - 6L to 2L | S - 10L to 3.3LS - 10L to 3.3L | S - 10L to 3.3LS - 10L to 3.3L | Stuff SackStuff Sack | Stuff SackStuff Sack |
Fill Weight | 6.3oz 180g | 7.2oz 205g | 10.6oz 300g | 12.2oz 345g | 15.2oz 430g | 24.7oz 700g | 21.9oz 620g | 4.1oz 115g | 3.5oz 100g |
Fits Up To Height | 6 ft 183 cm | 6 ft 6 in 198 cm | 6 ft 183 cm | 6 ft 6 in 198 cm | 6 ft 183 cm | 6 ft 6 in 198 cm | 6 ft 183 cm | 6 ft 6 in 198 cm | 6 ft 183 cm |
Season Rating | Warm WeatherWarm Weather | Warm WeatherWarm Weather | 2 Season2 Season | 2 Season2 Season | 2.5 Seasons2.5 Seasons | 3.5 Season3.5 Season | 3.5 Season3.5 Season | Summer or Sleeping Bag LinerSummer or Sleeping Bag Liner | Summer or Sleeping Bag LinerSummer or Sleeping Bag Liner |
Temperature Rating (ISO Lower Limit) | 40ºF 5ºC | 40ºF 5ºC | 28ºF -2ºC | 28ºF -2ºC | 18ºF -8ºC | 5ºF -15ºC | 5ºF -15ºC | 50ºF 10ºC | 50ºF 10ºC |