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Therm-a-Rest Hyperion 20 UL Sleeping Bag - Moosejaw
 
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Therm-a-Rest Hyperion 20 UL Sleeping Bag
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Therm-a-Rest Hyperion 20 UL Sleeping Bag

Therm-a-Rest Hyperion 20 UL Sleeping Bag is rated 4.4 out of 5 by 49.
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4.4 Star Rating
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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.

Product Description

Item No.   10402460

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.

Down Insulation

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

Max User Height (Short): 5 ft 6 in.
Shell Fabric: 10D Nylon RipStop w/ DWR
Features: Draft Collar, Ultralight
Disclaimer: We only ship this brand to US Addresses.
Bag Weight (Regular): 20 oz.
Foot Circumference (Long): 46 in.
Compressed Bag Size: 3 Liters
Shoulder Circumference (Regular): 57 in.
Extreme Temperature Rating: -9 Degrees Fahrenheit
Hip Circumference (Short): 49.5 in.
Foot Circumference (Regular): 43 in.
Max User Height (Long): 6 ft 6 in.
Sleeping Bag Lining: 10D Ripstop Nylon
Bag Weight (Long): 22 oz
Foot Circumference (Short): 40 in.
Hip Circumference (Long): 51 in.
Bag Weight (Short): 1 lb 3 oz
Shoulder Circumference (Long): 58 in.
Shoulder Circumference (Short): 55 in.
Hip Circumference (Regular): 49.5 in.
Ultralight: Yes
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 5 out of 5 by from A Great Quilt Alternative I use this on overnight hiking trips and sheep hunting. I compare it to my Enlightened Revelation Quilt. Both are great ultralight sleep systems that have concessions. Bag is a bit snug fitting, but it's enough space to be comfortable. The snug fit means there is no dead air inside the bag with you. Great storage options, super light, packs very small (I'd say x1.5 my 1L Nalgene). Very well built, material is soft. Order came quickly and price was fair. Good job on this bag Thermarest.
Date published: 2023-10-03
Rated 4 out of 5 by from Light for degree rating. The 3/4 zipper takes getting used to. Warmer weather makes it tough. It is a narrower fit but is right for my body. Lightest bag in this class.
Date published: 2023-08-28
Rated 5 out of 5 by from A number of years ago A number of years ago I purchased a Hyperion 0 deg bag to replace a worn out old favorite. The Hyperion quickly turned into my new go to bag. Warm, very light, and quite roomy. It also became a favorite of my wife's for bike packing. This year I decided to get the Hyperion 20 for warmer trips. Only drawback is securing it from my wife who currently has it on a pack raft trip! Cascade Designs truly nailed it with Hyperion line up!
Date published: 2023-07-10
Rated 5 out of 5 by from Great bag Have spent just a few nights in the bag. So far I love it. Packs down small and is crazy light. I haven’t had the chance to test the lower temp limit yet so time will tell. Only negative is the zipper not being full length, but this was a known feature and a compromise I was willing to make. Looking forward to many comfortable nights.
Date published: 2023-06-27
Rated 3 out of 5 by from Extremely light- poor quality I 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 from Great Value I 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 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 from Almost perfect Incredibly 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
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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!
Answered by: Marty Moose
Date published: 2021-04-11
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