Sea to Summit Spark SPII Down Sleeping Bag

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The new ultralight Spark™ Series of sleeping bags are designed to keep you as warm as possible while minimising packed weight and size. The Spark SPII 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 adventure bag.


  • Contoured mummy shape for comfort and efficient insulation
  • Updated sizing provides extra room for both shoulders and hips while still maintaining insulation efficiency
  • Responsible Down Standard 850+ Loft Premium Goose ULTRA-DRY Down™ for maximum insulation value
  • Ultralight 7D and 10D fabrics for minimal weight and packed size
  • Vertical box baffles in the torso area accommodates extra down and boosts warmth around the core, vertical baffles on chest optimises positios of down to prevent it moving during use
  • Lower part of the bag uses a sewn through horizontal baffle construction to minimise weight
  • Half zip with two sliders aids access and allows ventilation from mid-section of bag
  • Draft tube prevents heat loss through the zip
  • Includes hood draft collar
  • Includes Ultra-Sil™ Nano Compression Bag for compact storage
  • Note that this bag is not designed to pair with another


Featured Gear Summer Clearance 2024
Fits to 183cm (Regular), 198cm (Long)
Shoulder Width 75cm (Regular), 79cm (Long)
Foot Width 44cm (Regular), 47cm (Long)
Rolled Size ⌀13 x 25cm
Compression 2.5 litres (Regular), 3.5 Litres (Long), 3.3 to 1.3 litres sack volume
Fill ULTRA-DRY Down™ 850+ Loft premium Goose Down (min. 90% down)
Fill Weight 300g (Regular), 345g (Long)
Average Weight 490g (Regular), 560g (Long)
Outer Material 10D nylon
Inner Material 7D nylon
Temperature Rating 4°C comfort EN13537 rating woman / minus 2°C Lower comfort EN13537 rating for men

ULTRA-DRY Down™: With the introduction of water-repellent ULTRA-DRY Down™ Seat to Summit have virtually eliminated the negative effects moisture has on down. The ULTRA-DRY Down™ water-repellent treatment protects the down from external moisture and condensation from inside the bag. It is a permanent (no loss of treatment effect has been seen in over 14 wash cycles) Nano-level water repellent polymer treatment applied to Sea to Summit high loft, high quality down. The Nano-thin treatment vastly improves the down's reaction to water without effecting its weight or loft performance. ULTRA-DRY Down™ retains over 60% more loft and absorbs 30% less moisture when compared with untreated down. Sea to Summit sleeping bags dry out 60% faster than bags with untreated down. The Nano-level treatment also inhibits bacterial and microbial growth, which makes Sea to Summit sleeping bags more hygienic and improves their lifespan.

Responsible Down Standard (RDS): The RDS is helping to shift the entire down and feather industry towards more humane animal rearing and handling practices. Overseen by the industry leading Textile Exchange, the RDS requires independent, third party assessments of all aspects of animal rearing and handling throughout the entire supply chain. By only using down that meets the audited requirements of the RDS we can have confidence that each phase of the collection process has been completed with the welfare and ethical treatment of waterfowl in mind. To find out more about how the RDS is improving animal welfare during down collection, please visit (link will open a new window).


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