How to Choose Sleeping Bags for Backpacking
Therm-a-Rest Hyperion 32 Down Sleeping Bag
$519.95
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Designed for backcountry pursuits, the Therm-a-Rest Hyperion 32 down sleeping bag helps keep your pack featherweight without sacrificing an ounce of performance.
Key Details
Fill
900-fill-power Nikwax Hydrophobic goose down
Weight
Long: 1 lb. 2 oz.
Compressed Volume
2.8 liters
Temperature Rating (F)
32 degrees (F)
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- 900-fill-power Nikwax Hydrophobic Downâ„¢ resists moisture and maintains loft up to 60 times longer than untreated down
- Lightweight materials and precise design allow for a small packed size
- Thermally efficient box baffled construction uses mesh walls to maximize loft and minimize cold spots in key areas
- Ergonomic shape and long zipper provide a human-friendly fit
- SynergyLinkâ„¢ Connectors integrate the bag with a mattress (not included) for optimal efficiency and comfort; removable for versatility
- Zoned insulation maximizes warmth and saves weight by intentionally placing fill where you need it most: 70% on the top and sides with 30% on the back
- Shell fabric has been treated with a durable water repellent (DWR) to resist moisture
- Storage sack and compression stuff sack included
- Responsible Down Standard certification ensures that the waterfowl in the down supply chain are treated humanely
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 the Therm-a-Rest Hyperion Product LineView all Therm-a-Rest 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 | 32 degrees (F) - ISO |
| Tested Comfort | 41 degrees (F) - ISO |
| Temperature Rating (F) | 32 degrees (F) |
| Temperature Rating (C) | 0 degrees (C) |
| Weight | Long: 1 lb. 2 oz. |
| Ultralight | Yes |
| Shell | Ripstop nylon |
| Zipper Location | Left |
| Insulation Type | Down |
| Water-Resistant Down | Yes |
| Fill | 900-fill-power Nikwax Hydrophobic goose down |
| Fill Weight | Long: 10 ounces |
| Lining | Ripstop nylon |
| Sleeping Bag Shape | Mummy |
| Fits Up To (in.) | Long: 78 inches |
| Shoulder Girth (in.) | Long: 58 inches |
| Hip Girth (in.) | Long: 51 inches |
| Stuff Sack Size | 5.5 x 6 inches |
| Stuff Sack Volume | 3 liters |
| Compressed Volume | 2.8 liters |
| Gender | Unisex |
| Sustainability | Down certified to the Responsible Down Standard (RDS) |
