Spark Down Sleeping Bag -18°C - Regular

Ultralight, High-Performance Warmth for Minimalist Adventures.

The Sea to Summit Spark 850+ Down Sleeping Bag redefines ultralight performance. Filled with RDS-certified 850+ fill power goose down treated with non-PFAS Ultra-Dry Down™, it delivers an exceptional warmth-to-weight ratio and moisture resistance. A technical hood, full-length draft tube, and highly water-repellent hood and footbox fabric seal out wind and condensation, while the 10D nylon shell with non-PFAS DWR and super-breathable 10D liner minimize weight without sacrificing comfort. Hybrid baffle construction—box baffles in the torso and sewn-through in the legs—maximizes thermal efficiency where it’s needed most.

Weighing just over 1lb (Regular) and compressing to as little as 2.5 liters, the Spark is ideal for fast-and-light missions where every gram counts. Includes an Ultra-Sil compression sack and storage cell for efficient packing.