Spark Ultralight Sleeping Bag 40º

Enginereed to keep you warm at the lightest weight and smallest compressed size

Highlights

BEST USE: 

Ultralight Backpacking

PERFORMANCE: 

Warm Weather

WEIGHT: 

Regular: 12oz | 340g

Long: 13.6oz | 385g

COMPRESSED VOLUME: 

Regular: 1.5 liters

Long: 2.2 liters

Tech Specs

• BEST USE Ultralight Backpacking
• COMES WITH Ultra-Sil™ compression bag and storage cell
• INSULATION Ultra-Dry Down 850+ Loft
• SHAPE Mummy
• SHELL FABRIC Ultralight 10D Nylon Shell
• ZIP OPTIONS Left-side #3 YKK zipper

  40º Regular  40º Long BAG SERIES
Spark 1 Spark 1 BAG WEIGHT 12oz 13.6oz COMPRESSED VOL (ASTM STANDARD) 1.5 L 2.2 L FILL WEIGHT 6.3 oz 7.2 oz FITS UP TO HEIGHT 6 ft 6ft 4 in SEASON RATING Warm Weather Warm Weather

FAQ

Suitable for cooler temperatures?

Yes. The 5°F or possibly the 18°F will work in late Fall. The Spark 5°F will take you down to winter temperatures when paired with a greater than 3.5 R-Value sleeping mat like the Comfort Light Insulated.

Really suitable as a sleeping bag liner?

Yes. You could use the Spark 50°F, or even the Spark 40°F to boost the performance of a bag for cold-weather use. Adding one of these to a 20°F bag might make more sense than buying a 0°F bag for occasional winter use.

Able to be zipped to another sleeping bag?

No. Even though the 18°F or 5°F have full-length side zippers, they are not designed to be coupled to a sleeping bag with a right zipper (for instance the Flame 18°F or 5°F).