Sea to Summit Circuit 15F Down Sleeping Bag

$299.00 – $339.00

Light and packable, this Sea to Summit sleeping bag is filled with Ultra-Dry down to keep you warm and comfy. Plus, its adaptable design seals tight when it's cold or opens to a quilt on warm nights.

Fill

650+-fill-power Ultra-Dry duck down

Weight

Short: 2 lbs. 6.1 oz.

Regular: 2 lbs. 8.92 oz.

Long: 2 lbs. 13.5 oz.

Compressed Volume

Short: 9 liters

Regular: 9.7 liters

Long: 10.8 liters

Temperature Rating (F)

15 degrees (F)

Adaptable, lightweight and packable
Lightweight breathability: Premium 20-denier fabric offers perfect next-to-skin comfort night after night after night
Ultra-Dry down, soft-touch fabric and recycled materials keep you warm and comfy
Hybrid box-baffle construction prevents down migration, eliminating cold spots for even warmth and consistent insulation
Opens flat for airflow on warm nights or zips closed to lock in warmth when temperatures drop for comfort in all conditions
Quality 650+-fill-power Ultra-Dry duck down and lightweight fabrics allow the bag to pack down small into the supplied compression sack
Soft liner and wider, thermally-efficient shape enhance warmth and comfort—no matter which position you sleep in—and give you room to move
Wraparound zipper lets you fully open the footbox for maximum venting or fine-tune airflow to regulate temperature

Imported.

Temperature ratings are intended as a guideline to help you compare products, rather than a guarantee of warmth, since many different factors contribute to your comfort while you sleep. Backpacking bags are typically rated for temperature according to an independent testing protocol—currently International Organization for Standardization (ISO) 23537, though some older items followed European Norm (EN) 13537. Testing is based on a person wearing one base layer and a pair of socks, sleeping on an insulated surface with a minimum R-value of 5.38.

Each bag then gets 2 ratings: the Comfort rating is the lowest temperature at which the bag will keep the average "cold sleeper" comfortable, and the Lower Limit rating is the lowest temperature at which the bag will keep the average "warm sleeper" comfortable. Some brands determine their own temperature rating by aligning to the Comfort rating for women’s bags, to the Lower Limit rating for men’s bags, or somewhere in the middle for nongendered bags.

View all Sea to Summit Backpacking Sleeping Bags

Best Use	Backpacking
Tested Lower Limit	15 degrees (F) - ISO
Tested Comfort	23 degrees (F) - ISO
Temperature Rating (F)	15 degrees (F)
Temperature Rating (C)	-9 degrees (C)
Weight	Short: 2 lbs. 6.1 oz. Regular: 2 lbs. 8.92 oz. Long: 2 lbs. 13.5 oz.
Shell	100% recycled polyester
Zipper Location	Left
Insulation Type	Down
Water-Resistant Down	Yes
Fill	650+-fill-power Ultra-Dry duck down
Fill Weight	Short: 1 lb. 7.4 oz. Regular: 1 lb. 9.2 oz. Long: 1 lb. 12.7 oz.
Sleeping Capacity	1-person
Lining	100% recycled polyester
Sleeping Bag Shape	Mummy
Fits Up To (in.)	Short: 67 inches Regular: 73 inches Long: 78 inches
Shoulder Girth (in.)	Short: 57 inches Regular: 57 inches Long: 61 inches
Hip Girth (in.)	Short: 55 inches Regular: 55 inches Long: 59 inches
Stuff Sack Volume	20 liters
Compressed Volume	Short: 9 liters Regular: 9.7 liters Long: 10.8 liters
Gender	Unisex
Sustainability	Contains recycled materials Down certified to the Responsible Down Standard (RDS)