An ultralight down bag for fast-and-light adventures and mid-summer hut trips, the Sea to Summit Spark Sp 1 down sleeping bag also works well as a liner bag to boost warmth in colder temps.
Fill
850-fill-power goose down
Weight
Long: 13.6 ounces
Compressed Volume
Long: 2.2 liters
Temperature Rating (F)
40 degrees (F)
- 10-denier shell and 7-denier liner materials help to achieve the incredible lightweight and compact packed size
- Sewn-through baffle construction
- Sewn through vertical baffles on chest optimize position of down to prevent it moving during use
- Half-length zipper with single slider aids access while keeping weight to a minimum
- Updated sizing provides extra room for both shoulders and hips while still maintaining insulation efficiency
- Ethically sourced down; Responsible Down Standard (RDS) Certified
- QuiltLock System compatible; securely connect any Sea to Summit quilt to your sleeping bag to boost your sleep system's performance for colder conditions (quilt not included)
- Includes a Sea to Summit Ultra-Sil Nano compression bag and larger storage cell
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 | 40 degrees (F) - ISO |
| Tested Comfort | 48 degrees (F) - ISO |
| Temperature Rating (F) | 40 degrees (F) |
| Temperature Rating (C) | 5 degrees (C) |
| Weight | Long: 13.6 ounces |
| Ultralight | Yes |
| Shell | Nylon |
| Zipper Location | Left |
| Insulation Type | Down |
| Water-Resistant Down | Yes |
| Fill | 850-fill-power goose down |
| Fill Weight | Long: 7.2 ounces |
| Sleeping Capacity | 1-person |
| Lining | Nylon |
| Sleeping Bag Shape | Mummy |
| Fits Up To (in.) | Long: 77 inches |
| Shoulder Girth (in.) | Long: 62 inches |
| Hip Girth (in.) | Long: 62 inches |
| Stuff Sack Volume | 2.5 liters |
| Compressed Volume | Long: 2.2 liters |
| Gender | Unisex |