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Sea to Summit Spark SPI 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 I is great for summer adventures with its ULTRA-DRY Down 850+ loft premium goose down and high-performance 10D nylon shell and 7D lining fabrics. It features a contoured mummy shape for efficient insulation and superior performance.



  • Contoured mummy shape for efficient insulation
  • Ideal for mid-summer fast hikes or adventure racing
  • Doubles as a liner to significantly boost the warmth of a second bag
  • Updated sizing provides extra room for both shoulders and hips while still maintaining insulation efficiency
  • Includes lightweight Ultra-Sil™ Nano compression bag for compact storage
  • Ultralight 7D fabrics for minimal weight and packed size
  • RDS 850+ Loft Premium Goose ULTRA-DRY Down™ for maximum insulation value
  • Vertical chest baffles prevent down migration and cold spots
  • Sewn through box baffle construction to minimise weight and keep down in position
  • Sewn through vertical baffles on chest optimises position of down to prevent it moving during use ½ zip with single slider aids access while keeping weight to a minimum
  • 850+ Loft: 850+ Fill Power indicates that 1 oz of down will re-expand to over 850 cubic inches after compression. Higher loft means that less down can be used to achieve the same temperature rating – important for performance sleeping bags. The loft and down quality/composition are independently tested by the International Down and Feather Laboratory (IDFL) – a copy of the certification is supplied with every Sea to Summit sleeping bag.
  • ULTRA-DRY Down™: ULTRA-DRY Down™ is a permanent nano-level water repellent polymer treatment applied to our down which protects it from external moisture and condensation from inside the bag virtually eliminating the negative effects moisture has on down.
  • Responsible Down Standard Certified
Fits to 183cm (Regular), 198cm (Long)
Shoulder Width 75cm (Regular), 79cm (Long)
Foot Width 44cm (Regular), 47cm (Long)
Rolled Size ⌀11 x 23cm
Compression 1.5 litres (Regular), 2.2 litres (Long), 2.5 to 1 litre sack compression
Fill ULTRA-DRY Down™ 850+ Loft premium Goose Down (min. 90% down)
Fill Weight 180g (Regular), 205g (Long)
Average Weight 340g (Regular), 385g (Long)
Outer Material 10D nylon
Inner Material 7D nylon
Temperature Rating 9°C comfort EN13537 rating woman / 5°C Lower comfort EN13537 rating for men

Additional information


Regular, Long


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