How to Choose Sleeping Bags for Backpacking
Sea to Summit Spark 30F Down Sleeping Bag - Women's
$449.00
Built for women who want minimal weight but maximum comfort, the women's Sea to Summit Spark 30F sleeping bag is filled with 850+ fill-power down, and the 10-denier shell keeps moisture out.
Key Details
Fill
850+ fill-power goose down
Weight
Regular: 1 lb. 4.6 oz.
Compressed Volume
Regular: 4.7 liters
Temperature Rating (F)
30 degrees (F)
This item pays for membership!
$44
10% Reward
on this and every eligible full-price item*
+
$30
Bonus Card
valid for 30 days after joining*
=
$74
Value
Start earning when you buy a $30 lifetime membership.
Keep shopping
- Women-specific shape and body mapping result in warmth and comfort without the weight
- Women-specific fit: narrower at the shoulders (for reduced weight) and wider between the hips and knees to allow for a natural, side-sleeping position
- RDS-certified, 850+ fill-power goose down with a non-PFAS Ultra-Dry Down treatment for maximum thermal performance
- Ultralight, breathable 10-denier nylon liner and a 10-denier shell with a non-PFAS durable water repellent (DWR) provide comfort and shed moisture
- Hood and footbox have a highly water-resistant, breathable fabric for extra moisture protection
- Technical hood and zipper draft tube prevent precious warmth from escaping
- Hood and anatomically shaped footbox provide excellent warmth retention without the claustrophobic feel of some ultralight bags
- Hybrid box baffles in torso and sewn-through baffle construction in leg area
- YKK #5 zippers with zipper plow provide reliable, snag-free operation
- Half-length zipper for ultralight packability
- Stuff sack included
- Sea to Summit Guarantee is offered for the lifetime of this product
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 | 19 degrees (F) - ISO |
| Tested Comfort | 30 degrees (F) - ISO |
| Temperature Rating (F) | 30 degrees (F) |
| Temperature Rating (C) | -1 degrees (C) |
| Weight | Regular: 1 lb. 4.6 oz. |
| Ultralight | Yes |
| Shell | Nylon |
| Zipper Location | Right |
| Insulation Type | Down |
| Water-Resistant Down | Yes |
| Fill | 850+ fill-power goose down |
| Fill Weight | Regular: 13.2 ounces |
| Sleeping Capacity | 1-person |
| Lining | Nylon |
| Sleeping Bag Shape | Mummy |
| Fits Up To (in.) | Regular: 66 inches |
| Shoulder Girth (in.) | Regular: 55 inches |
| Hip Girth (in.) | Regular: 55 inches |
| Stuff Sack Size | 11.4 x 6.7 x 4.3 inches |
| Stuff Sack Volume | Regular: 5 liters |
| Compressed Volume | Regular: 4.7 liters |
| Gender | Women's |
| Sustainability | Down certified to the Responsible Down Standard (RDS) |
