The Spark -18C Down Sleeping Bag by Sea to Summit is designed for the swashbucklers of the cold-weather camping world.

A 10D Nylon construction in the shell, lining, hood, and footbox offer lightweight breathability and water resistance on every outdoor retreat, while its RDS certified 850+ FILL Power goose down provides both comfort when unpacked and a compact pack down – treated with ULTRA-DRY down water-repellent to protect from moisture on the damper days off the grid. To minimise cold spots too, vertical and horizontal chest baffles are present in both the lower-half and base, while a box wall baffle construction exists throughout the entirety of the bag.

Sporting a Mummy Fit for thermal efficiency and minimal weight too, the technical hood also offers a soft-touch adjustment, sitting deep for a warmer winter-camping experience. A -10°C comfort rating and -18°C lower limit also has it suitable for extreme temperature drops in sub-zero conditions on those cold-weather camping trips, embellished with a durable 3/4-length #5 primary zipper, zip plow, two sliders, and a down-filled draft tube that follows it along the top. Plus, the double draft collars traps heat effectively for a toasty night’s sleep amid frosty climates.

Experience the beauty of winter camping with the benefits of warmer sleep, thanks to the Sea to Summit Spark -18C Down Sleeping Bag.

• -10°C Comfort rating, -18°C Lower Limit rating
• 10D Nylon shell and lining
• 10D Nylon waterproof, breathable hood and footbox
• Double draft collars for trapping heat
• Single, down-filled draft tube runs along top of all zippers
• Vertical chest and horizontal chest baffles in lower half and base
• Box wall baffles construction throughout
• Mummy Fit for maximum thermal efficiency and minimal bulk/weight
• 3/4-length #5 zipper with zip plow and 2 x sliders
• RDS certified 850+ FILL Power goose down for comfort and compact packing
• ULTRA-DRY down water-repellent treatment for water resistance
• Compatible with separately available Sea to Summit quilts
• Compatible with separately available Sea to Summit Women’s bags
• 20L compression bag included