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Sea To Summit Spark SPII Sleeping Bag

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Ultra-light and technical, our Spark™ Series bags are designed to keep you as warm as possible while minimising packed weight and size. - The Spark™... Read more
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Ultra-light and technical, our Spark™ Series bags are designed to keep you as warm as possible while minimising 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.

- Our ULTRA-DRY Down™ water-repellent treatment protects the down from external moisture and condensation from the inside of the bag, virtually eliminating the negative effects moisture has on down. All Sea to Summit Down Sleeping Bags use Responsible Down Standard (RDS) certified down. The ULTRADRY Down™ protection also makes the Spark™ an impressive hard-alpine or adventure racing bag, where every gram is counted and down has never been a viable option.


  • 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


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Size: Regular


Recommended user height: up to 183cm


Packed dimensions: 13 x 19cm


Compressed volume: 2.5L


Weight: 490g


Fill weight: 300g


Internal Chest circumference: 150cm


Internal Hip circumference: 130cm


Internal Foot circumference: 88cm


Fill: ULTRA-DRY Down™ 850+ Loft premium Goose Down (min. 90% down)


Outer material: 10D nylon


Inner material: 7D nylon


Temperature rating: 4°C comfort rating woman / minus 2°C Lower comfort rating for men


ULTRA-DRY Down™: With the introduction of water-repellent ULTRA-DRY Down™ Sea 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.