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Last updated January 1st, 2020
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The Therm-a-Rest Hyperion 20 UL Sleeping Bag is an ultralight mummy bag designed for backpacking and mountaineering. Compressible down insulation and a tapered mummy shape team up to keep weight and packed size to a minimum. The high-quality 900-fill goose down features hydrophobic Nikwax™ treatment for improved performance in wet or humid environments. Removable sleeping pad straps allow you to integrate your sleep system to boost comfort and thermal efficiency. Boasting a 20°F temperature rating and weighing in at only 20oz for the regular size, this sleeping bag will keep you toasty warm through most 3-season applications without weighing you down.
Products on Sale are Discontinued Styles or Colors.
The Therm-a-Rest Hyperion 20 UL Sleeping Bag is an ultralight mummy bag designed for backpacking and mountaineering. Compressible down insulation and a tapered mummy shape team up to keep weight and packed size to a minimum. The high-quality 900-fill goose down features hydrophobic Nikwax™ treatment for improved performance in wet or humid environments. Removable sleeping pad straps allow you to integrate your sleep system to boost comfort and thermal efficiency. Boasting a 20°F temperature rating and weighing in at only 20oz for the regular size, this sleeping bag will keep you toasty warm through most 3-season applications without weighing you down.
Products on Sale are Discontinued Styles or Colors.
FEATURES of the Therm-a-Rest Hyperion 20 UL Sleeping Bag
Ultralight design and construction gives the regular size a weight of 20 ounces
900 fill Nikwax Hydrophobic Down™ stays dry and retains loft up to 60 times longer than untreated down
Down also absorbs 90% less water and dries three times faster without using dangerous PFCs
Lightweight materials and precise design allow for a smaller packed size than ever before for incredible packability
Box baffled construction uses mesh walls to maximize loft and minimize cold spots
SynergyLink™ connectors integrate the bag with a mattress for optimal efficiency and comfort, and are also removable for versatility
ThermaCapture™ lining to trap radiant body heat and retain warmth without adding bulk or weight
Zoned insulation maximizes warmth and saves weight by intentionally placing fill where you need it most
Also features a heat-trapping draft collar, zipper draft tube, snag-free zipper, and cinchable hood
Offers an extreme temperature rating of 20°F / -6°C
A compression sack and storage sack are included
Fabric Details
Shell: 10D Nylon RipStop with DWR
Lining: 10D Nylon RipStop ThermaCapture™
Fill: 900 Fill Goose Nikwax Hydrophobic Down™
Product Specifications
Compressed Bag Size:
3 Liters
Features:
Ultralight, Draft Collar
Shell Fabric:
10D Nylon RipStop w/ DWR
Bag Weight (Short):
1 lb 3 oz
Bag Weight (Regular):
20 oz.
Bag Weight (Long):
22 oz
Extreme Temperature Rating:
-9 Degrees Fahrenheit
Sleeping Bag Lining:
10D Ripstop Nylon
Shoulder Circumference (Short):
55 in.
Max User Height (Short):
5 ft 6 in.
Max User Height (Long):
6 ft 6 in.
Hip Circumference (Short):
49.5 in.
Foot Circumference (Short):
40 in.
Foot Circumference (Regular):
43 in.
Foot Circumference (Long):
46 in.
Shoulder Circumference (Regular):
57 in.
Hip Circumference (Regular):
49.5 in.
Shoulder Circumference (Long):
58 in.
Hip Circumference (Long):
51 in.
Ultralight:
Yes
Disclaimer:
We only ship this brand to US Addresses.
Gender:
Mens
Best Use:
Ultralight Backpacking, Backpacking
Insulation:
Down
Temperature Rating:
11 - 20 Degrees Fahrenheit
Exact Temperature Rating:
20 Degrees Fahrenheit
Sleeping Bag Shape:
Mummy
Max User Height (Regular):
6 ft
Fill Details:
900 Fill Power Goose Down
Product Reviews
Rated 3 out of
5 by
Kristofer from
Extremely light- poor qualityI received the Hyperion 20 a few weeks ago and headed out to the backcountry short after. After the first night I noticed a tear on the outside of the bag. The temperature dropped to 20, however, though combining with a NeoAir XTherm on top of a RidgeRest I couldn’t get a good night sleep.
Thermarest did great in creating an extremely light sleeping bad. Sadly it does not hold up to the standards I’ve set based on years of experience with high performance gear from them.
Hope I can continue to purchase with confidence also in the future.
Date published: 2023-03-27
Rated 5 out of
5 by
Great Value for Specs from
Great ValueI bought this bag for some spring desert camping, and this bag is perfect for me. It is slim at the bottom, and there isn’t an additional zipper, but it works well for my sleeping habits. I’m really impressed with the way this bag compresses and would recommend if you’re looking for a 20 degree bag.
Date published: 2023-03-21
Rated 5 out of
5 by
Jacob O. from
Ultralight furnace.This bag is fantastic. It’s incredibly light, and warm. Its only downside is that the fit is snug but that’s to be expected in a bag that’s as warm and as light as this one. I used it on several backpacking hunts this season and it’s packed size is minuscule so I’ve got more room to pack out game
Date published: 2022-12-17
Rated 4 out of
5 by
Yesh from
Almost perfectIncredibly light, surprisingly warm, packs down remarkably small. Biggest two issues are zipper related. The small zipper is a pain to use, and their is insufficient protection to ensure you don't tear the VERY thin materials with the zipper. I use more care than I should every time I zip and unzip this thing. Overall, I'm happy with it. If weight and pack size are your top priorities, and you still want a bag, not quilt, this is your bag.
Date published: 2022-12-16
Rated 4 out of
5 by
Ceasar G. from
Performs wellGreat bag, packs down well, is very efficient without being too snug even for someone with wide shoulders. One thing I would change is the length of the zipper I would like a full length zip instead of the 3/4.
Date published: 2022-10-05
Rated 5 out of
5 by
Jeffrey M. from
Alaskan Adventure BagJust got back from using this sleeping bag on an Alaskan fly-in hunt for sheep and black bear near Delta Junction. After 10 days of usage, I would rate the bag an overall of 5 stars.
Things most people don’t consider… this bag is rated for 32F comfort (ideal use temps), 20F limit (lowest you want to use it) and -9F risk (you might get severely injured). The hunt was low 30s to high 20s at night and the bag never had me more than slightly chilled, wearing only merino wool base layers. I would agree that this bags comfort limit is about 32F.
Another reviewer gave this bag a very low rating as it wasn’t warm enough, then went on to say they wore several layers of clothes in the bag. This is not ideal. In a sleeping bag, especially compact ones like this, it’s a best practice to only wear your base layers and nothing more. When you start layering up, you won’t allow the down to insulate your body and trap heat, making you colder. I actually tested this, one night wearing three layers and found it very cold. Next nigh, only base layers, and was much warmer.
Date published: 2022-09-19
Rated 5 out of
5 by
Dyan M. from
Great lightweight bag!!The material feels amazing and it is a perfect fit for my 5'1" frame.
Date published: 2022-08-14
Rated 1 out of
5 by
Hampus from
Very coldCalling it - 6 is a joke. Used it down to temperatures just above 0 and even with baselayer, slacks, two sweaters, socks, beanie, gloves and a silk liner i kept waking up being to cold. Used it in a msr hubba hubba with a thermarest neoair. I would rate it a +5 bag. Only good for summer. So much money wasted here since i need a 3 season bag and now have to buy another one since thermarest lie about there temperatur ratings.
How small can it compress to in liters and/or inches?
Asked by: Kate
Great question! The compressed volume is the size of a Nalgene bottle, approximately 3 liters.
Answered by: Foxxy Cleopatra
Date published: 2021-05-09
Do you have choice of left or right sided zippers? (My husband and I like to zip our bags together)
Asked by: Babs
Hi Babs, thanks for the question! Sadly this bag is only made in a left-zip option at this time and cannot be zipped together. Sorry about that but I hope this helps!
