How to Choose Sleeping Bags for Backpacking
Anacortes
Sale Ends Sep 7
Sea to Summit Circuit 30F Down Sleeping Bag
Sale Ends Sep 7
$209.19 – to $224.19Save up to 25%
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 opens to a quilt on warm nights or seals tight when it's cold.
Key Details
Fill
650+-fill-power Ultra-Dry duck down
Weight
Regular: 1 lb. 12.92 oz.
Long: 2 lbs. 0.1 oz.
Compressed Volume
Regular: 5.4 liters
Long: 6 liters
Temperature Rating (F)
30 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 BagsEach 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.
| Best Use | Backpacking |
|---|---|
| Tested Lower Limit | 30 degrees (F) - ISO |
| Tested Comfort | 35 degrees (F) - ISO |
| Temperature Rating (F) | 30 degrees (F) |
| Temperature Rating (C) | -1 degrees (C) |
| Weight | Regular: 1 lb. 12.92 oz. Long: 2 lbs. 0.1 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 | Regular: 14.5 oz. Long: 1 lb. 8 oz. |
| Sleeping Capacity | 1-person |
| Lining | 100% recycled polyester |
| Sleeping Bag Shape | Mummy |
| Fits Up To (in.) | Regular: 73 inches Long: 78 inches |
| Shoulder Girth (in.) | Regular: 57 inches Long: 61 inches |
| Hip Girth (in.) | Regular: 55 inches Long: 59 inches |
| Stuff Sack Volume | 13 liters |
| Compressed Volume | Regular: 5.4 liters Long: 6 liters |
| Gender | Unisex |
| Sustainability | Down certified to the Responsible Down Standard (RDS) Contains recycled materials |
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