Sea To Summit Spark SpIII Down Sleeping Bag 18F

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The Spark Ultralight Mummy Sleeping Bag Series spans everything from an ultralight down-filled liner, to a mid-winter fast-and-light sleeping bag. Each model uses premium materials and no-frills design to provide cutting-edge performance.

Ultralight does not mean ultra-tight: The Spark mummy sleeping bags are snug but still have adequate wiggle room for the performance-oriented, backcountry user.


  • 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
  • Zipper-length trimmed for gram-saving performance:
  • 50°F, 40°F, and 28°F have 1/3-length zippers
  • 18°F and 5°F have full-length side zippers
  • Baffle construction:
  • 50°F and 40°F have sewn-through construction
  • 28°F has baffles in the torso and sewn through in the leg area
  • 18°F and 5°F are fully baffled
  • Shape:
  • 50°F , 40°F and 28°F - Contoured mummy
  • 18°F and 5°F - Broader mummy

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