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  • Contoured mummy design for efficient insulation, with updated sizing that provides extra room for shoulders and hips
  • RDS 850+ Loft ULTRA-DRY Down for superior insulating power, moisture resistance and compressibility (Responsible Down Standard certified)
  • 10D Nylon shell and 7D lining fabrics
  • Vertical chest baffles prevent down migration and cold spots
  • Horizontal sewn-through baffles in the lower half of the bag minimise weight
  • Half zip with two sliders to aid access and allow ventilation from bag's mid-section
  • Draft tube and draft collar prevents heat loss through the zipper and hood
  • Includes storage cell and lightweight Ultra-Sil compression bag for compact storage.

Sea to Summit Sleeping Bag Spark SPI

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Sea to Summit's new ultralight Spark SPI sleeping bag is designed to keep you as warm as possible while minimising packed weight and size. Great for adventure when you need a high performance sleeping bag but don’t want to be weighed down by one, Sea to Summit’s Spark Series Bags are what you reach for.

The Spark I temperature rating is 9°C Comfort, 5°C Lower limit (-9°C Extreme). Regular weighs just 340g and long 385g and packs down to approx 25cm x 13cm diameter.

The Spark SPI combines ULTRA-DRY Down™ 850+ loft premium goose down, light-gauge #3 YKK® zip, high-performance 10D nylon shell and 7D lining fabrics and a contoured mummy shape for efficient insulation and superior performance.

Other features include a hybrid construction with box wall baffles over the torso for core warmth and a sewn through construction at the legs to shave weight, a half-length zip and a draft tube and a full hood to keep in your warmth. A 3-season bag ideal for mid-summer fast hikes or adventure racing.


  • Colour: Light Grey / Yellow
  • Shape: Mummy
  • Length: Regular or Long
  • Weight: Reg 340g, Long 385g
  • Circumference Dimensions: Reg chest 150cm x hip 130cm x foot 88cm, Long chest 158cm x hip 138cm x foot 94cm
  • User Height: Reg up to 183cm, Long up to 198cm
  • Insulation Type: RDS 850+ Loft ULTRA-DRY
  • Temperature Ratings: 9°C Comfort, 5°C Lower limit, -9°C Extreme