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 Down™ 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
- SynergyLink™ 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) |
Buying Advice
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ShreddyKruger
Seattle, WA
Unbeatable Packability
6 years ago
Hands down the lightest, most packable bag I've ever used without sacrificing warmth or comfort. It basically packs down to a size that resembles a Nalgene. The only drawback I've experienced has to do with the straps that hold the pad in place, which have a tendency to come loose. It's a small price to pay, however, for how compressible the bag is.
Yes , I recommend this product
Hoefelli
Seattle, WA
Ultra Light, Ultra Compact, Ultra Cozy
6 years ago
I used this sleeping bag on a week-long (46.6mi) coastal camping trip in British Columbia and I couldn't have been happier with its performance! My old sleeping bag was purchased back in 2010, so the difference was like night and day in regards to the size that it packed down to as well as its overall weight. The packed down size was much smaller than what I was used to and I was extremely impressed with how compact this bag truly is! Its overall weight was considerably less than what I was accustomed to (weighing in at only 1-pound!) as well and it was extremely cozy and warm when it came time to crash for the day, even on the coldest/wettest of nights along the coast. The SynergyLink™ Connectors were just icing on the cake, I've never had a bag with anything like these before and each morning that I woke up I was still firmly attached to my sleeping pad.
Yes , I recommend this product
gerbren
Really capable
3 years ago
I have only tried a handful of sleeping bags as i'm pretty much a rookie hiker. However i am absolutely amazed by how this bag performs. I can compress it to the size of a football! thisi is reallt usefull to me when i go bike packing, when pack size is important. I always use a small liner, but i have never had any chills in this bag. even at around 0 degrees celcius. some people mention it is is chilly, but it seems most of those people are using the uber lite, or some similar sleeping mat. end of the day im super impressed with its weight to warmth ratio and it has yet to let me down!
Originally posted on a Cascade Designs brand site
Jill R.
Bag turned me into an ultralight believer
6 years ago
I used to think that going ultralight was cutting some comfort, warmth, or was too costly. This bag is fairly priced especially considering all of the benefits I got during a week long through hike in Canada. It helped cut my sleeping bag weight down by over 2 lbs packs INSANELY SMALL and I also found myself toasty warm (typically always cold) with space to sleep on my side. This helped keep my pack light on my back while simultaneously able to get a good night sleep so I wasn't a grouch to my partners the next day and could enjoy the amazing scenery well-rested and wide-eyed.
Originally posted on a Cascade Designs brand site
Reedrunner
COLD at 45F
4 years ago
I love the size and weight of this sleeping bag. However, it fails at its primary job, keeping me warm at night. Even a 45F night in August and my shoulder gets cold if I sleep on my side. The bag simply does not have enough insulation. As small, lean person I do tend to sleep cold, but my 20F bag from another company easily keeps me toasty down to 20F. The Hyperion 32F isn't even warm to its stated comfort range of 41F. Minor drawbacks that I would put up with for the weight and size are the 2/3rds length zipper and the face cinch system.
Originally posted on a Cascade Designs brand site
Bskurty
SL, UT
Poor Zipper
4 years ago
Poor zipper combined with 10D shell resulted in a tear my first night. Luckily I had some tenacious tape to patch it without losing any down. But you must be extremely careful while zipping to avoid it catching. I'll be going with a Magma for the slight weight penalty, the zipper on it is far superior; worth the weight. It's also a hair short for me to use with the hood, I'm 6'-0.5".
Age:25–34
Weight:150–175 lbs.
Height:6'0"
No, I do not recommend this product
zuesmajor
not as described
5 years ago
Used on 4 backpacking trips. All ranging from 60 to 36 degree F weather. The temperature rating is pretty accurate but the reason I returned it is because the zipper is the worst I’ve ever used. Constantly snags and the hood sucks. Doesn’t provide a great seal. I’d get the REI magma instead.
No, I do not recommend this product
Corrine N.
ultralight high quality, a bit tight
8 months ago
Great lightweight sleeping bag! Packs down incredibly small. I would say 32F is a survival limit, not a comfort limit. I’ve had a few uncomfortable nights around freezing temps trying to push this limit with a sleeping bag liner and, well, I didn't die so that was cool. My only complaint about this bag is that the knees are very narrow so there is really only room for your legs to be straight down. My hip muscles were always mad at me after using this bag.
Originally posted on a Cascade Designs brand site
@Hoefelli
Ultra Light, Ultra Compact, Ultra Cozy
6 years ago
I used this sleeping bag on a week-long (46.6mi) coastal camping trip in British Columbia and I couldn't have been happier with its performance! My old sleeping bag was purchased back in 2010, so the difference was like night and day in regards to the size that it packed down to as well as its overall weight. The packed down size was much smaller than what I was used to and I was extremely impressed with how compact this bag truly is! Its overall weight was considerably less than what I was accustomed to (weighing in at only 1-pound!) as well and it was extremely cozy and warm when it came time to crash for the day, even on the coldest/wettest of nights along the coast. The SynergyLink:tm: Connectors were just icing on the cake, I've never had a bag with anything like these before and each morning that I woke up I was still firmly attached to my sleeping pad.
Originally posted on a Cascade Designs brand site
Anonymous
Extremely light
4 years ago
Used this and their neoair uberlite on a recent camping trip north of Milwaukee WI along Lake Michigan; these did not provide the advertised comfort. All their gear packs down extremely light and was comfortable but did not provide warmth or comfort on a 35 degree night. Packed up and drove home at 3am. If this was labeled as 45 degree bag I'd agree with it more but given it's cost I wouldn't recommend it.
Originally posted on a Cascade Designs brand site
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