Hyperion Sleeping Bag: 20F Down
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Why We Like The Therm-a-Rest Hyperion Sleeping Bag: 20F Down
Details
- Lightweight and packable bag built to keep you on the move
- 900-fill Nikwax Hydrophobic Down maintains loft when moist
- Zoned insulation organizes down to minimize weight, maximize warmth
- SynergyLink connectors hold your pad in place while you roll over
- Item #CAS00EO
- Material
- 10D nylon ripstop (DWR coating)
- Insulation
- 900-fill Nikwax Hydrophobic Down
- Shape
- mummy
- Max User Height
- [small] 5ft 6in, [regular] 6ft, [long] 6ft 6in
- Shoulder Circumference
- [small] 55in, [regular] 57in, [long] 58in
- Hip Circumference
- [small] 48.5in, [regular] 49.5in, [long] 51in
- Foot Circumference
- [small] 40in, [regular] 43in, [long] 46in
- Bag Length
- [small] 73in, [regular] 80in, [long] 85in
- Draft Tube
- yes
- Pockets
- none
- Pad Retainer
- SynergyLink Connectors (removable)
- Fill Weight
- [small] 11.5oz, [regular] 12.5oz, [long] 14oz
- Degree
- 20F
- European Norm/ISO Comfort Rating
- 32F
- European Norm/ISO Lower Limit Rating
- 20F
- Storage Sack
- yes
- Stuff Sack
- yes
- Stuff Size
- 6 x 8in
- Claimed Weight
- [small] 1lb 3oz [regular] 1lb 4oz [long] 1lb 6oz
- Manufacturer Warranty
- lifetime
Reviews
Q&A
Overall Rating
4.5 based on 40 ratings
Review Summary
Fits Slightly Small
Screen reader users: the following list provides a visual scale to illustrate the product fit. Please refer to the heading above for the fit type in text.What do you think about this product?
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Selecting an option will reload the available reviews on the pageSeptember 10, 2024
Lightweight
Amazing lightweight and warm. Zipper only goes down hallway of the bag could be a deciding factor for some.
Originally reviewed on a Cascade Designs brand site
August 6, 2024
Surprisingly warm for weight. Bring it back! Love this bag.
I was surprised how warm this bag was after I first pulled it out. Frankly, it felt flimsy. But I figured I'd try it in a *35 overnight and see if I could find a way to shave the weight of my monster bag. Yes you have wear a base layer when you sleep but this kept me toasty and was really an all around game changer for me. The 900 fill is the secret I think. Would love to buy a short one for my daughter but they're all sold out. Bring it back!
Originally reviewed on a Cascade Designs brand site
July 22, 2024
High Quality light weight material
High Quality light weight material that packs very small
Originally reviewed on a Cascade Designs brand site
October 3, 2023
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.
Originally reviewed on a Cascade Designs brand site
August 28, 2023
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.
Originally reviewed on a Cascade Designs brand site
July 10, 2023
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!
Originally reviewed on a Cascade Designs brand site
June 27, 2023
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.
Originally reviewed on a Cascade Designs brand site
March 27, 2023
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.
Originally reviewed on a Cascade Designs brand site
December 17, 2022
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
Originally reviewed on a Cascade Designs brand site
December 7, 2022
Great Sleeping Bag
- Familiarity:
- I've used it once or twice and have initial impressions
- Size Bought:
- Regular
- Height:
- 5' 9"
- Weight:
- 170
It's lightweight and packable. I haven't had a chance to get a full profile on the bag yet, but haven't had any problems with it. A seriously light sleeping bag that kept me warm.
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This product can expose you to chemicals including Toluene which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.