How to Choose Sleeping Bags for Backpacking
Sea to Summit Spark Sp II Sleeping Bag
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This ultralight 850-fill-power down sleeping bag balances size, weight and warmth, making the lightweight Sea to Summit Spark Sp II bag ideal for summer backpacking, cycle touring and mountaineering.
Shop similar productsKey Details
Fill
850-fill goose down
Compressed Volume
2.9 liters
Temperature Rating (F)
35 degrees (F)
- High-loft, premium 850-fill-power European goose down offers superb warmth with minimal weight; Ultra-Dry Down™ water-repellent treatment protects down from moisture
- Ultra-Dry Down is a water-repellent polymer treatment applied to the down; Ultra-Dry Down retains 60% more loft and absorbs 30% less moisture than untreated down
- With a European Norm (EN) lower-limit rating of 35°F, the Sea to Summit Spark Sp II will keep you warm on 3-season backpacking adventures
- Ultralight 10-denier nylon fabric with a durable water repellent treatment sheds moisture
- Soft 15-denier nylon fabric lines the Sea to Summit Spark Sp II Sleeping Bag for excellent comfort next to skin
- 1/3-length zipper saves weight over a full-length zipper
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 Mountaineering |
|---|---|
| Tested Lower Limit | 35 degrees (F) - EN |
| Tested Comfort | 44 degrees (F) - EN |
| Temperature Rating (F) | 35 degrees (F) |
| Temperature Rating (C) | 2 degrees (C) |
| Shell | Ripstop nylon |
| Zipper Location | Left |
| Insulation Type | Down |
| Water-Resistant Down | Yes |
| Fill | 850-fill goose down |
| Lining | Nylon |
| Sleeping Bag Shape | Mummy |
| Stuff Sack Size | 5 x 10 inches |
| Stuff Sack Volume | 3.3 liters |
| Compressed Volume | 2.9 liters |
| Gender | Unisex |
