Sea to Summit Spark −9°C Down Sleeping Bag

The Sea to Summit Spark −9°C is an ultralight down sleeping bag designed for cold-weather adventures where every gram matters. Its premium 850+ fill-power goose down delivers impressive warmth without excessive weight or bulk, making it ideal for alpine missions, tramping, bikepacking and lightweight touring.

A performance mummy shape, technical hood and draft protection help retain warmth, while the lightweight recycled nylon shell keeps the packed size to a minimum.

Key Features

• Premium 850+ fill-power, RDS-certified goose down

• Ultra-Dry Down treatment helps protect the insulation from moisture

• ISO lower-limit temperature rating of −9°C

• ISO comfort temperature rating of −2°C

• Lightweight mummy shape improves thermal efficiency

• Technical hood and draft collar help retain body heat

• Half-length zip reduces weight and heat loss

• Lightweight recycled nylon shell with water-repellent finish

• Highly compressible for space-conscious packing

• Includes a compression sack and storage cell

Who Is It For?

The Spark −9°C is ideal for lightweight hikers, trampers, bikepackers and alpine adventurers who need dependable warmth without carrying a heavy or bulky sleeping bag.

Specifications

• Lower Limit: −9°C

• Comfort Rating: −2°C

• Insulation: 850+ fill-power goose down

• Down Certification: Responsible Down Standard

• Shape: Performance mummy

• Weight: Approximately 730g in Regular

• Maximum User Height: Regular 183cm; Long 198cm

• Zip: Half-length

• Included: Compression sack and storage cell

Temperature note: The −9°C figure is the bag’s ISO lower-limit rating. Cold sleepers and those seeking a more comfortable night should use the −2°C comfort rating when choosing their sleeping bag.