Spark Sp III Down Sleeping Bag - Long -8C

Ultralight, High-Performance Down Sleeping Bag.

The Sea to Summit Spark SP III is engineered for ultralight backpackers and alpine adventurers who demand maximum warmth with minimal weight and bulk. Features 850+ fill power RDS-certified goose down treated with non-PFAS Ultra-Dry Down™, ensuring reliable insulation even in damp conditions. The 10D nylon shell and liner fabrics keep weight low while offering breathability and durability. A contoured mummy shape, technical hood, and draft tube enhance thermal efficiency, and the 1/3-length YKK zipper minimizes weight without sacrificing functionality. Weighing approximately 22 oz (625g) and compressing to a remarkably small volume, the Spark SP III is ideal for three-season use where every ounce counts.