The Sea to Summit Spark Down Sleeping Bag is the definitive choice for those who push the limits of speed and weight. This technical mummy-style bag provides an exceptional balance of warmth and minimal mass, making it ideal for bikepacking, trekking, and alpine climbing. Its streamlined design ensures you stay warm during chilly nights without feeling weighed down during the day. The premium goose down insulation is treated to maintain loft even in damp conditions, providing reliable comfort throughout the night.
Setting up camp is effortless with this ultra-compressible bag. It easily fits into the smallest corners of your pack, leaving plenty of room for other essentials. The soft-touch inner lining feels great against the skin, while the ergonomic hood can be cinched tight to trap heat. Whether you are sleeping on a high mountain ridge or in a hidden valley, the Spark provides a cozy retreat after a long day of exertion.
Technically, the Spark features 850+ Fill Power premium goose down, which is RDS-certified and treated with Ultra-Dry Down. This treatment significantly improves water resistance, ensuring the down stays dry and insulating longer. The shell is constructed from high-performance 10D nylon, providing durability and wind protection at a fraction of the weight of standard fabrics. The torso area uses box-wall baffles to maximize warmth by preventing down from shifting, while the lower section utilizes a sewn-through construction to minimize weight.
The half-length YKK zipper with a snag-free plow ensures easy entry and exit without the bulk of a full-length zip. A draft tube along the zipper and a technical hood further prevent heat loss. These features work together to provide a comfort limit of -1°C, making it a versatile choice for three-season use. The bag is also compatible with Sea to Summit quilts for added warmth during colder expeditions.
Comfort temperature: 4°C
Lower limit temperature: -1°C
Total weight: 493g
Fill weight: 265g
Insulation: 850+ Loft Ultra-Dry Goose Down
Material: 10D Nylon shell and lining
Maximum user height: 185 cm
Compressed volume: 4.5 L
Shape: Mummy
Zipper: Half-length #5 YKK
