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Sea to Summit

Sea to Summit Spark II - Regular

1 review   |  

The Sea to Summit Spark II is an ultra-light and technical down sleeping bag, designed to keep you warm whilst minimising packed weight and size. 

Offering an excellent fit whilst providing extra warmth, the Sea to Summit Spark II is a high performance yet lightweight sleeping bag. With a comfort temperature limit of -2*C, the Summit Spark II utilises a sewn through construction (which minimises weight) and vertical baffles on the chest to maintain down positioning for heat reflection. The updated sizing provides extra room for shoulders and hips without compromising thermal efficiency and a 1/2 zip aids access and ventilation. This bag is ideal for mid-summer fast hikes or adventure racing.

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.

Sea to Summit's 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.

More Help? For further assistance on choosing your down sleeping bag, we have an article explaining fill power, the pros and cons of down over synthetic insulation and more info on caring for your bag available to view here: A Guide to Down Sleeping Bags.


  • Sewn through construction minimises weight
  • 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
  • Updated sizing provides extra room for both shoulders and hips while still maintaining insulation efficiency
  • ULTRA-DRY Down 850+ Loft 90% Down Cluster Premium Goose Down certified Responsible Down Standard (RDS)
  • 10D shell and 7D liner materials help to achieve the incredible lightweight and compact packed size
  • Includes lightweight Ultra-Sil™ compression bag and storage cell
      Note: This bag is not designed to pair with another


        • Maximum body size: 183 cm
        • Inner bag length: 192 cm
        • Comfort Temperature: 4 °C
        • Comfort Temperature limit: -2 °C
        • Extreme temperature limit: -18 °C
        • Maximum inner width: 75 cm 
        • Footbox width: 44 cm
        • Insulated collar: No
        • Main Fabric: 10D Nylon & 7D Liner
        • Filling: 300g of ULTRA-DRY Treated down 
        • Fill power 850+ cuin
        Weight: 490g
          Customer Reviews
          5.0 Based on 1 reviews
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          Rachel B.
          United Kingdom United Kingdom
          Perfect for bike packing

          I’ve used the Spark II a couple of times since getting it and it’s great. I use it for bike packing bivvying. I’m female and get cold overnight but its kept me perfectly warm down to temps of 4 degrees so far. It packs down small in its compression sack (I can get a silk liner in too) and fits easily into my saddle bag with room for extra clothes and other bits. Service from R&R was great, getting the pack out to me on next day delivery when I bought it very last minute for a weekend away.

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