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Sea to Summit Spark 40°F Ultralight Sleeping Bag

The Sea to Summit Spark 40°F Ultralight Sleeping Bag is engineered for adventures where reducing weight and bulk are paramount. Utilizing premium 850+ fill power ULTRA-DRY Down and an ultralight 10D nylon shell, this sleeping bag offers impressive warmth while maintaining an incredibly light and compact profile. Its contoured mummy shape and thoughtful design features make it an excellent choice for warm-weather expeditions.
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Sea to Summit Spark 40°F Ultralight Sleeping Bag

Key Features

40°F (5°C) ultralight down sleeping bag suitable for warm weather backpacking, bikepacking, and touring.
High-loft 850+ fill power down insulation (Responsible Down Standard certified) treated with ULTRA-DRY Down to enhance moisture resistance and maintain loft.
Ultralight and compressible 10D nylon shell with 7D liner fabric for minimal weight and bulk; one-third length, left-side YKK zipper.
Contoured mummy shape provides adequate room for a natural sleeping position; sewn-through construction.
Regular size accommodates users up to six feet tall; weighs 12 ounces; compresses to 1.5 liters with included Ultra-Sil compression sack.

Who Is This Product Best For?

Perfect for ultralight backpackers, bikepackers, and travelers seeking a minimalistic yet warm sleeping solution for mild to moderate conditions.

Pro & Cons

Pros

  • Exceptional warmth-to-weight ratio, ideal for ultralight backpacking.
  • Compact design allows for easy packing and minimal space usage.
  • High-quality materials ensure durability and longevity.
  • ULTRA-DRY Down treatment offers improved performance in damp conditions.

Cons

  • Premium price point may be a consideration for budget-conscious buyers.
  • Sewn-through construction may result in cold spots in cooler temperatures.

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