Therm-a-Relaxation Hyperion Sleeping Bag Overview [2022] BikeHikeSafari

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It is a gear overview concerning the Therm-a-Relaxation Hyperion Sleeping Baggage in 2022. The sleeping bag overview covers the entire Therm-a-Relaxation Hyperion Sleeping Bag Vary however I’ve targeted on the Therm-a-Relaxation Hyperion 20F/-6C which I’ve extensively examined and reviewed.

Relating to ultralight sleeping luggage the Therm-a-Relaxation Hyperion vary has been the king since its introduction within the spring of 2019. However do you have to purchase it? I’ve spent over 2500 nights sleeping in sleeping luggage over time and have examined many luggage over time, together with the Hyperion from Therm-a-Relaxation. So this in-depth overview will let whether it is for you.

All of the Therm-a-Relaxation Hyperion Sleeping Baggage use high-quality 900+ Nikwax Hydrophobic down, ultralight 10D material on the interior and outer shell, with the outer material coated with a DWR. Because the lightest sleeping bag of their class, Ultralight Via-Hikers and Backpackers have a whole lot of causes to love the Hyperion sleeping luggage.

Maintain studying to seek out out extra.

Therm-a-Relaxation Hyperion Sleeping Bag Specs

Therm-a-Relaxation Hyperion 20F/-6C

Therm-a-Rest Hyperion 20F

Weight: 20 oz / 567 grams
Down Fill Energy:
Hyperdry 900 fill
Fill Weight:
11.5 oz / 330 grams
EN / ISO Rated:

> Ultralight
> Very compact
> Excessive-quality down
> Nice for again and aspect sleepers
> Very small inside dimensions could make for a good match
> Not the perfect for abdomen sleepers

Therm-a-Relaxation Hyperion 32F/0C

Weight: 16 oz / 460 grams
Down Fill Energy:
Hyperdry 900 fill
Fill Weight:
8.5 oz / 250 grams
EN / ISO Rated:

> Extraordinarily Ultralight
> Smallest Pack Measurement in Class
> Excessive-quality down
> Nice for again and aspect sleepers
> Very small inside dimensions could make for a good match
> Not the perfect for abdomen sleepers

Therm-a-Relaxation Hyperion Ultralight Sleeping Baggage

The Therm-a-Relaxation Hyperion was first launched within the Spring of 2019. The ultralight Therm-a-Relaxation Hyperion Sleeping Bag vary grew to become a hit as they chased the ultralight sleeping bag market. As soon as upon a time, ultralight backpackers and thru-hikers have been seen as freaks who compromised sturdiness and security whereas chasing decrease ounces and grams. Now ultralight is mainstream and accessible to all. And the Hyperion vary is unashamedly focused on the backpacker who needs the lightest attainable sleeping bag with the best attainable high quality.

Therm-a-Relaxation has seen no must make any adjustments since that point as it’s nonetheless among the finest ultralight sleeping luggage available on the market.

The temperatures of the baggage have been independently examined to EN/ISO requirements. The sleeping bag commonplace, ISO 23537, was launched as the brand new sleeping bag commonplace. The temperature rankings on the Hyperion sleeping luggage have been examined to this commonplace. Personally, I like this dedication to making sure the sleeping bag rankings are independently examined quite than a greatest guess on how heat you ought to be like some firms do. Extra on the temperature rankings somewhat later.

Down sort/fill energy

The Therm-a-Relaxation Hyperion Sleeping Baggage are stuffed with 900+ loft Hyperdry Goose Down in 2022. That is the top-of-the-range down used on any Therm-a-Relaxation Sleeping Bag. It’s not solely ultra-lightweight but in addition has good water resistance qualities as they use Nikwax water repellent down. This implies in case you are unlucky sufficient to seek out your self in very dangerous climate and your sleeping bag will get moist, it is not going to soak up as a lot water as different sleeping luggage and nonetheless be capable to loft and hold you heat.


Let’s check out how the Therm-a-Relaxation Hyperion Sleeping Baggage are made with the options such because the Inside and Outer Shell materials, zippers, baffles, draft tubes, hood, and climate resistance.

Outer Shell material

The exterior face material of the Therm-a-Relaxation Hyperion Sleeping Bag is made utilizing a 10-Denier Ripstop Nylon which is coated with a DWR coating to forestall drops of water from coming into the bag. Like nearly all trendy ultralight sleeping luggage, the material mild and nearly see-through, particularly once you maintain it as much as the sunshine.

When testing the Therm-a-Relaxation Hyperion Sleeping Baggage I poured a big quantity of water on the outer material to check the water resistance of the material and the water beaded properly and ran off the material. Extra on that later.

Inside material

The Therm-a-Relaxation Hyperion Sleeping Baggage use the identical 10 Denier material that’s used on the outer shell minus the DWR coating. It’s not solely ultralight but in addition resistant to ripping.

I did the rip check on the material through the use of my fingers to try to rip the material, even across the stitching space. I used to be unable to tear it. With a pointy object or knife, I might minimize the material simply however I don’t need to deliberately destroy this superior sleeping bag.

Climate resistance

As talked about above, I did drop fairly a little bit of water on the outer face material to check the water repellency and high quality of the DWR coating. I can affirm it would present an honest stage of water resistance that’s at the very least equal to or higher than all of the competitors within the Ultralight Sleeping Bag market.

The Therm-a-Relaxation Hyperion Sleeping Bag is sweet sufficient to sleep exterior below the celebrities when condensation comes down in a single day.

Disclaimer: I don’t advocate that you simply pour a complete bottle of water over your sleeping bag to check its water resistance. I do the testing so simply how good or dangerous this product is.

Therm-a-rest Hyperion Sleeping Bag water resistant DWR coating


The Hyperion Sleeping luggage use a system of baffles which are somewhat completely different from different sleeping luggage available on the market. Whereas the field baffles are not any completely different from many different sleeping luggage, they stuff 70% of the down into the highest layer and 30% within the backside layer. What which means is the layer that’s dealing with down onto the sleeping pad has much less insulation and the highest layer does all of the work of preserving you heat.

In concept, this method is nice. However there’s one problem. What occurs once you roll over at night time the 70% of the insulation is on the underside? Effectively, if this happens you’ll not keep as heat. To fight this, the Hyperion Sleeping Baggage have a strap system that they wish to name, SynergyLink Connectors that join the sleeping bag to the sleeping pad and forestall this from occurring.

When testing this method I discovered it to work surprisingly nicely. Anybody who has used an ultralight backpacking quilt might be aware of such a system, however sleeping bag homeowners are usually not so aware of such a system. The sleeping bag stayed in place nicely sufficient for me to roll round within the bag and never induce the underside aspect of the bag with much less down to maneuver to the highest. Whereas aspect sleeping the bag turned simply sufficient for me to be very snug and never have the hood cowl my mouth.

Like most ultralight sleeping luggage, I’d have preferred every baffle to be filled with barely extra down. Not like an overfill, however sufficient to cut back clumping of the down which occurs over time and is a sign that the sleeping bag is in want of a wash. In reality, it would must be carried out on occasion to maintain the bag acting at its greatest.

The SynergyLink Connectors keep the Thermarest Hyperion Sleeping Bag in place.
The SynergyLink Connectors hold the Therm-a-Relaxation Hyperion Sleeping Bag in place.

Zips and Draft Tube

The Hyperion sleeping bag collection contains a 1/2-length zip and a draft tube.

I attempted my greatest to destroy the zip and tried to snag it on the interior draft collar. I used to be in a position to snag the zip after I tried however for most individuals, there’s nothing to fret about. There’s a little bit of a studying curve in terms of utilizing the zip and locking it in place with the press stud subsequent to the hood. Once I say that, the bag is a good match and is fiddly to shut. After a number of makes an attempt, it isn’t a difficulty, and after just one night time of use, it’s simple sufficient to make use of.

Total, the zips and draft tubes do a very good job and there’s not a lot that may be faulted. However because of the tight inside dimensions of the Hyperion sleeping luggage, I discovered it might be a problem to zip up the bag with out guaranteeing I used to be tucked inside completely. With apply, it grew to become simpler.

Therm-a-rest Hyperion Sleeping Bag snag free zips


The hood on the Hyperion is sweet and contains a full collar the entire method round. It’s a very tight match and in contrast to many different sleeping luggage, it is not going to be attainable to sleep along with your backpacking pillow contained in the hood. The hood is simply too tight a match for that. Should you use a backpacking pillow it should be exterior the hood. This isn’t a giant problem however one thing you could concentrate on. That very same compact dimension of the hood ensures there are usually not many air pockets that take power to warmth, power that’s higher spent preserving you heat.

The Drawcords and toggles used to cinch the hood closed all work as anticipated and won’t be a difficulty for customers.

The neck and hood collars might be somewhat greater and will have extra overfilled for higher warmth retention. In my expertise the hood collar and neck collar areas of sleeping luggage are the primary locations to get soiled from physique oils and sweat which ends up in the down changing into extra compressed and clumped, making them much less environment friendly at preserving you heat.

Once I examined the Therm-a-Relaxation Hyperion Sleeping Bag I spent a whole lot of time sleeping on my aspect and rolling over lots. The hood labored completely and was in a position to transfer with me as I turned, even when utilizing the straps to carry the sleeping bag onto the ultralight sleeping pad. I used the Therm-a-Relaxation Uberlite sleeping pad when testing this sleeping bag. I might discover no higher ultralight sleeping system than this.

As talked about above, perhaps a bit extra overfill within the hood and draft collars could be a very good enchancment. And I barely bigger match could be good. However as that is such a distinct segment ultralight bag I’m not certain that’s one thing that Therm-a-Relaxation will ever do as it may well solely add extra weight to the bag.

Therm-a-rest Hyperion Sleeping Bag compact hood

Stuff Sack

The usual Stuff Sack equipped with the Hyperion Sleeping Baggage is sweet and there’s no want for anybody to contemplate upgrading to the rest. It’s light-weight and may be compressed with the aspect straps to compress the baggage into a really small dimension of round 2.5L. In reality, the Hyperion is essentially the most compressible sleeping bag in its class of ultralight sleeping luggage. Others could come shut however that is the perfect, solely ultralight hoodless sleeping luggage or backpacking quilts are extra compact.


As talked about above the stuff sac will compress the bag to a smaller dimension. Seek advice from the Specification chart for detailed comparisons.


The Therm-a-Relaxation Hyperion Sleeping Baggage are essentially the most packable of all of the ultralight sleeping luggage of their class. A mixture of the excessive loft down, 10D material, and compact zip all contribute to the small pack dimension.

Therm-a-rest Hyperion Sleeping Bag stuff sack size


The interior sizing of the Therm-a-Relaxation Hyperion Sleeping Baggage is on tight dimension. There may be not a whole lot of room to maneuver round inside in comparison with different ultralight sleeping luggage. There are professionals and cons of tight mummy-style sleeping bag sizing.

Though the Hyperion fashions are traditional mummy-style sleeping luggage, they’ve very compact inside dimensions. In reality, their inside dimension are one of many smallest of their class. These compact inside dimensions permit for a higher potential to maintain you heat as you waste much less power preserving air pockets heat. Because of this, Therm-a-Relaxation can add much less down into the bag and use much less material in a lighter bag. All of this can be a constructive once you need an ultralight sleeping bag.

The tight inside dimensions have some adverse elements that must be highlighted. If you wish to put on a winter-grade down jacket whilst you sleep it would make for a good match. This generally is a draw back if you wish to prolong the temperature vary of the baggage in the course of the shoulder seasons. Having stated that, they’ll match an insulated sleeping bag liner with out problem, in order that may be a greater possibility for shoulder season journey. Should you get chilly toes, you possibly can put on a pair of down booties contained in the sleeping bag to remain heat.

Once I examined the sleeping bag I discovered that the SynergyLink Connectors did a very good job of preserving the sleeping bag dealing with up. When sleeping on my again the Hyperion Bag was nice, excellent. Once I rolled over and slept on my aspect it was surprisingly good. I assumed it would casue a difficulty but it surely didn’t.

Once I slept on my again, which I generally tend to do on occasion, I discovered myself caught contained in the hood. That is my solely criticism of this bag simply concentrate on this. A abdomen sleeper could have a difficulty with this bag. Having stated that, most individuals hardly ever sleep of their abdomen, so for most individuals, the compact dimension and ultralight weight might be value it.

Total, the Therm-a-Relaxation Hyperion Sleeping Baggage are tight-fitting sleeping luggage resulting from their inside dimensions. If you’re chubby, look elsewhere, this bag is not going to give you the results you want. If you’re of common construct or smaller then this might be the proper ultralight sleeping bag.

Side Sleeping in the Therm-a-Rest Hyperion 20F/-6C Sleeping Bag
Aspect Sleeping within the Therm-a-Relaxation Hyperion 20F/-6C Sleeping Bag. Observe how the bag will nonetheless work nice when aspect sleeping


When testing the bag I discovered the temperature score to be true to these acknowledged by Therm-a-Relaxation. Each the Hyperion 20F/-6C and Hyperion 32F/0C sleeping luggage have been examined to EN and ISO requirements so you’ll be able to relaxation assured that the sleeping bag will hold you heat on the temperatures as reported.

I’m usually a barely chilly sleeper until I ate a really heavy meal earlier than going to mattress (which may hold you hotter at night time). I’m a aspect sleeper on the whole and I discovered the bag to work nicely when sleeping on my aspect however not so good when sleeping on my again.

It’s tremendous essential to notice that there are 3 temperature rankings listed on every sleeping bag.

The Therm-a-Relaxation Hyperion Sleeping Baggage have the next EN /ISO permitted sleeping bag rankings:

Therm-a-Relaxation Hyperion 32F/0C Sleeping Bag:

Consolation: 41F/5C
Transition: 32F/0F
Danger: 5F/-15C

Therm-a-Relaxation Hyperion 20F/-6C Sleeping Bag:

Consolation: 32F/0C
Transition: 20F/-6C
Danger: -9F/-23C

Consolation Ranking

The Consolation Ranking is an important score as that is the temperature at which you can be heat and may sleep nicely. Sadly, the sleeping bag business as a complete fails to make use of this score for advertising causes. However use this as your base for what bag will hold you heat at what temperature.

That is often the temperature at which a girl will sleep nicely with out being chilly.

Restrict Ranking

The Restrict Ranking is utilized by nearly all sleeping bag producers because the temperature score for the sleeping bag. Few individuals will get a very good night time’s sleep on the restrict score until they know their our bodies nicely sufficient to know they’re heat sleepers.

I do know myself nicely sufficient to know I’m often midway between the Consolation and Restrict Ranking of an authorized EN/ISO examined sleeping bag. That is my very own private score of how heat I might be at night time inside a bag.

That is often the temperature score {that a} male, curled up on his aspect, will sleep OK. Most individuals will really feel chilly and never sleep nicely when sleeping on the restrict score temperatures.

Excessive Restrict

The Excessive Restrict is the restrict inside which individuals is not going to die from hypothermia or excessive chilly. You may be assured that if you happen to use the bag on the Excessive Restrict you’ll stay awake in any respect. If going into the Excessive Restrict be sure you get a Thermal Sleeping Bag Liner and even higher improve to a 4 Season Winter Sleeping Bag.

Therm-a-rest Hyperion Sleeping Bag temperature rating


As talked about above the sleeping bag is comparatively snug for everybody besides when sleeping in your abdomen. The interior dimensions of those ultralight sleeping luggage are:

Therm-a-Relaxation Hyperion 20F/-6C:
Size, Width & Top: 80 x 28.8 x 4.5 inches / 203 x 72 x 11.5cm (appropriate for an individual as much as 72 inches 183 cm)
Inner Dimension: 57 x 49.5 x 43 inches / 145 x 126 x 109 cm

Therm-a-Relaxation Hyperion 32F/0C:
Size, Width & Top: 80 x 28.8 x 4 inches / 203 x 72 x 10cm (appropriate for an individual as much as 72 inches 183 cm)
Inner Dimension: 57 x 49.5 x 43 inches / 145 x 126 x 109 cm

Caring to your Therm-a-Relaxation Sleeping Bag

When you have got a high-quality sleeping bag it’s value taking care to take care of it. Among the finest issues you are able to do is put on clear backpacking base layers to mattress to forestall sweat, filth, and physique oil from penetrating the liner of the sleeping bag. You can too use a sleeping bag liner to maintain it clear.

How one can retailer your Therm-a-Relaxation sleeping bag

The Therm-a-Relaxation Hyperion comes with a Lofting bag included which is an honest dimension and definitely ok to maintain a whole lot of the loft when storing it at residence. In contrast with different manufacturers it is without doubt one of the higher lofting luggage. I like them massive and oversize when storing my sleeping bag.

Therm-a-rest Hyperion Sleeping Bag loft bag

How one can wash your Therm-a-Relaxation Sleeping Bag

Over time the sleeping bag will lose a little bit of its loft and you might begin to complain that the bag is inferior to it was. Down could begin to clump collectively and it would begin to have some funky smells that appear to be a cross between a sweaty fitness center and an unwashed homeless individual. If this happens it’s time to give the sleeping bag a wash. I wrote an article on how to do that so check out How one can Wash a Down Sleeping Bag, for additional particulars on tips on how to wash your bag.


The Therm-a-Relaxation Hyperion collection are premium Sleeping Baggage at a premium value. Having stated that, they sit on the higher finish of the premium ultralight sleeping luggage market in 2022.

Whereas not low-cost, in case your aim is to have an ultralight againpacking gear setup then this is without doubt one of the greatest choices.

Therm-a-Relaxation Hyperion Vs The Relaxation

How does the Therm-a-Relaxation Hyperion evaluate to different Sleeping Baggage within the ultralight class in 2022? Try my full comparability overview of the Therm-a-Relaxation Hyperion and all of the Greatest Ultralight Sleeping Baggage 2022.

Greatest Suited Use

The Therm-a-Relaxation Hyperion Sleeping Baggage could be excellent for anybody who’s sleeping in temperatures above freezing or barely beneath within the case of the Hyperion 20F/-6C. The next forms of journeys could be excellent for this bag.

  • Via-hiking anyplace besides on the coldest of trails. If beginning early or ending late on the Appalachian Path, you possibly can add an insulated sleeping sheet liner and put on garments to mattress. Good for ultralight via mountaineering on the Pacific Crest Path.
  • Summer time mountaineering within the Rockies or Sierra in North America with the Hyperion 20F/-6C. Or into the Spring and Fall if utilizing the hotter Hyperion 20F/-6C.
  • Summer time mountaineering within the Alps in Europe or Climbing the Camino in Spain. The hotter luggage might be nicely suited to three season journeys in most locations.
  • Summer time mountaineering and 3-season mountaineering in Australia and New Zealand in most areas.
  • Summer time journeys in South America together with Patagonia so long as the nighttime temperatures are above freezing. You have to the Hyperion 20F/-6C if heading to the Excessive Andes of Bolivia, Peru, and Ecuador, and perhaps even an insulated sleeping bag liner for further heat when wanted. I examined this bag within the mountains and coastal vary of Chile, excellent.


The Therm-a-Relaxation Hyperion sleeping luggage are greatest suited to anybody wanting a high-quality ultralight sleeping bag. The temperature score for this bag is true to the specification for my part and based mostly on my use of the sleeping bag.

If you would like a sleeping bag for the summer time months and into the shoulder season for hotter climates then this might be for you. Simply ensure you are usually not chubby or your physique will not be too giant. It is a tight-fitting sleeping bag.

Relating to enhancements, I wish to see the sleepings enhance within the inside dimensions of the bag barely. Not by a lot, however by sufficient so I can use the sleeping bag with a down jacket or puffy jacket and nonetheless have a little bit of room to roll round. Simply 2 inches of inside dimension enhance would make this bag excellent for me. Regardless that it isn’t suited to abdomen sleepers, I feel the compromise of including much less all the way down to the underside of the bag is a superb concept to maintain the burden down.

Total, the Therm-a-Relaxation Hyperion vary of sleeping luggage is without doubt one of the lightest sleeping luggage available on the market in 2022. There may be little to fault, and never a lot that wants enhancing. If you’re an ultralight backpacker or thru-hiker, this might be your subsequent sleeping bag.

Examine Costs: to be up to date

Are Therm-a-Relaxation Sleeping Baggage any good?

Therm-a-Relaxation Sleeping Baggage are very prime quality and ultralight. The Therm-a-Relaxation Hyperion vary is thought to be a few of the lightest sleeping luggage available on the market proper now.

Does Therm-a-Relaxation Sleeping Baggage use Responsibly Sourced Down?

Sure, All of the down sleeping luggage from Therm-a-Relaxation are RDS licensed, ethically sourced down that may be traced as responsibly sourced.

Thermarest Hyperion Sleeping Bag Review Pin

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The creator, Brad McCartney from BikeHikeSafari is a small impartial adventurer and outside gear tester who owns and runs

BikeHikeSafari will not be half of a big weblog community like many different outside gear overview websites and all critiques on this website are impartial and sincere critiques of out of doors merchandise by the creator.

The creator, Brad McCartney is a really skilled triple crown thru-hiker, adventurer, and bike tourer having spent 1000s of nights sleeping in a tent and sleeping bag (Learn extra). He additionally used to handle an outside retail retailer and may be very skilled in what’s essential when utilizing and testing gear for critiques like this.

BikeHikeSafari won’t ever obtain any cash for critiques and doesn’t settle for sponsored critiques on this web site. All of the feedback on this overview are from the creator based mostly on his years of expertise. Hope this impartial overview was useful to you.

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