How to Choose Sleeping Bags for Backpacking
Sea to Summit Spark 30F Down Sleeping Bag
$449.00 – to $479.00
Delivering warmth while minimizing weight, the Sea to Summit Spark 30F sleeping bag is insulated with 850+ fill-power down, and the 10-denier shell sheds wind and condensation.
Key Details
Fill
850+ fill-power goose down
Weight
Regular: 1 lb. 1.4 oz.
Long: 1 lb. 2.9 oz.
Compressed Volume
Regular: 4.5 liters
Long: 5.1 liters
Temperature Rating (F)
30 degrees (F)
- RDS-certified, 850+ fill-power goose down with a non-PFAS Ultra-Dry Down treatment for maximum thermal performance
- 10-denier shell with a non-PFAS durable water repellent (DWR) keeps the hood and footbox highly water-resistant
- Ultralight, breathable 10-denier nylon liner
- Constructed with a technical hood and zipper draft tube to retain warmth
- Technical hood, anatomic footbox and an ergonomic mummy shape—ultralight doesn't have to mean ultratight
- Hybrid construction has box baffles in the torso and sewn-through in the leg area
- YKK #5 zipper with zipper plow provides reliable, snag-free operation
- Half-length zipper for ultralight packability
- Sea to Summit Guarantee is offered for the lifetime of this sleeping bag
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 | 39 degrees (F) - ISO |
| Temperature Rating (F) | 30 degrees (F) |
| Temperature Rating (C) | -1 degrees (C) |
| Weight | Regular: 1 lb. 1.4 oz. Long: 1 lb. 2.9 oz. |
| Ultralight | Yes |
| Shell | 10-denier nylon |
| Zipper Location | Left |
| Insulation Type | Down |
| Water-Resistant Down | Yes |
| Fill | 850+ fill-power goose down |
| Fill Weight | Regular: 9.3 ounces Long: 10.8 ounces |
| Sleeping Capacity | 1-person |
| Lining | 10-denier nylon |
| Sleeping Bag Shape | Mummy |
| Fits Up To (in.) | Regular: 72.5 inches Long: 77.5 inches |
| Shoulder Girth (in.) | Regular: 61 inches Long: 65 inches |
| Hip Girth (in.) | Regular: 53.1 inches Long: 57.1 inches |
| Stuff Sack Volume | 8 liters |
| Compressed Volume | Regular: 4.5 liters Long: 5.1 liters |
| Gender | Unisex |
| Sustainability | Down certified to the Responsible Down Standard (RDS) |
