Sea to Summit

Spark Sp III Ultralight Sleeping Bag - (18°F) - Long

Sold Out

5.0 star rating 0 Reviews

Ultra-light and technical, our Spark™ Series bags are designed to keep you as warm as possible while minimizing packed weight and size. The Spark™ Series spans everything from an ultralight liner to an expedition weight mid-winter bag. While the end usage is very different, they reflect a design ethos of matching weather conditions to the lightest bag possible. The secret to the impressive performance is a combination of premium materials and careful design. The RDS 850+ Loft premium goose down, light-gauge #3 YKK zip and high performance 10D Nylon shell and 7D lining fabrics, set the stage for superior performance. These materials are combined with a contoured mummy design for efficient insulation, and that mummy design is then tweaked for each model to best fit the use scenario.

• Ultralight 7D and 10D fabrics for minimal weight and packed size
• RDS 850+ Loft Premium Goose ULTRA-DRY Down™ for maximum insulation value
• Contoured mummy shape for comfort and efficient insulation
• Vertical chest baffles prevent down migration and cold spots
• NOTE: This bag is not designed to zip with another
• Uses a full box baffle construction to accommodate extra down and reduce cold spots
• Expedition mummy bag sizing provides extra space for layered clothing or extra wriggle room
• Vertical baffles in chest optimize position of down to prevent it moving during use
• Full side zip with two sliders provides easy access and extra ventilation options
• Zipper draft tube, hood and front neck draft collar to prevent warmth being lost when it’s needed

• Max user height: < 192 cm / 6'4''
• Girth:
Shoulder: 162 cm (64“)
Hip: 142 cm (56“)
Foot: 100 cm (39“)
• Fill weight: 17 oz / 485g
• Weight: 1 lb 10 oz / 745g
• Temperature:
Comfort: 29°F / -2°C
Lower limit: 18°F / -8°C
Extreme: -15°F / -26°C.
• 2.5 Season
Compressed volume: 5.4 L
Compression sack dimensions: 15.5x24cm / 6.1x9.6in


  • Women
  • Adult
Temperature Rating
  • 0°C to -20°C
Insulation Type
  • Down
  • Responsible Down

  • Your Cart is Empty