Hyperion™ 20F/-6C Sleeping Bag

  • Therm-a-Rest Hyperion™ Sleeping Bag - Regular
  • Therm-a-Rest Hyperion™ Sleeping Bag - Regular
  • Therm-a-Rest Hyperion™ Sleeping Bag
  • Therm-a-Rest Hyperion™ Sleeping Bag - SynergyLink™ Connectors
  • Therm-a-Rest Hyperion™ Sleeping Bag - SynergyLink™ Connectors
  • Therm-a-Rest Hyperion™ Sleeping Bag - Compression Sack
  • Therm-a-Rest Hyperion™ Sleeping Bag - Compression Sack
  • Therm-a-Rest Hyperion™ Sleeping Bag
  • Therm-a-Rest Hyperion™ Sleeping Bag
  • Therm-a-Rest Hyperion™ Sleeping Bag
  • Therm-a-Rest Hyperion™ Sleeping Bag
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Therm-a-Rest

Hyperion™ 20F/-6C Sleeping Bag

Size
Size Chart
Weighing a mere 1 lb. 4 oz, defy the cold and rest better while moving through the mountains with the Hyperion.
  • Ultralight: One of the lightest pieces in its class, the Hyperion sets a new standard for high-performance outdoor equipment.
  • 900-fill Nikwax Hydrophobic Down™ : Stays drier and maintains loft 60 times longer than untreated down.
  • Unrivaled Packability: Lightweight materials and precise design allow for a smaller packed size than ever before.
  • Box Baffled Construction: Uses mesh walls to maximize loft and minimize cold spots in key areas.
  • Comfort Fit: Ergonomic shape and longer zipper provide a more human-friendly fit than other ultralight bags.
  • SynergyLink™ Connectors: Removeable ultralight straps create a secure bag-to-sleeping pad connection that optimizes the comfort and thermal efficiency of your entire sleep system. SynergyLink Connectors function best with regular sized sleeping pads that are 3 inches thick or less when inflated.
  • 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.
  • Responsible Down Standard Certified: Certification that ensures that the waterfowl in the down supply chain are treated humanely.

    • Storage sack and compression stuff sack included.

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Description

Built to provide a featherlight pack weight and high-performance warmth, the Hyperion 20F/-6C is among the lightest in its class without sacrificing an ounce of performance. The bag uses thermally-efficient box baffled construction in key areas to ensure warmth and comfort in an ultralight package. Designed with high-quality materials and Therm-a-Rest performance features, the Hyperion keeps your pack light, giving you the freedom to move quickly in the backcountry.

This product cannot be sold or shipped to customers in the state of California or Minnesota.

Tech Specs

Small Regular Long
SKU 10700 10723 10724
Color Deep Pacific Deep Pacific Deep Pacific
Country of Origin Made in China Made in China Made in China
EN Comfort (C) 0 C 0 C 0 C
EN Comfort (F) 32 F 32 F 32 F
EN Extreme (C) -23 C -23 C -23 C
EN Extreme (F) -9 F -9 F -9 F
EN Limit (C) -6 C -6 C -6 C
EN Limit (F) 20 F 20 F 20 F
Fill material 900 Fill Goose Nikwax Hydrophobic Down RDS 900 Fill Goose Nikwax Hydrophobic Down RDS 900 Fill Goose Nikwax Hydrophobic Down RDS
Fill weight (Metric) 0.33 kg 0.36 kg 0.40 kg
Fill weight (Standard) 11.5 oz 12.5 oz 14 oz
Fits (Metric) 168 cm 183 cm 198 cm
Fits (Standard) 66 in 72 in 78 in
Girth Foot box (Metric) 102 cm 109 cm 117 cm
Girth Foot box (Standard) 40 in 43 in 46 in
Girth Hip (Metric) 123 cm 126 cm 130 cm
Girth Hip (Standard) 48.5 in 49.5 in 51 in
Girth Shoulder (Metric) 140 cm 145 cm 147 cm
Girth Shoulder (Standard) 55 in 57 in 58 in
Height (Standard) 4.5 in 4.5 in 4.5 in
Length (Metric) 185 cm 203 cm 216 cm
Length (Standard) 73 in 80 in 85 in
Lining fabric 10D Nylon RipStop 10D Nylon RipStop 10D Nylon RipStop
Packed dimension (Metric) 15 x 20 cm 15 x 20 cm 15 x 20 cm
Packed dimension (Standard) 6 x 8 in 6 x 8 in 6 x 8 in
Shell fabric 10D Nylon RipStop w/ DWR 10D Nylon RipStop w/ DWR 10D Nylon RipStop w/ DWR
Weight (Metric) 0.55 kg 0.58 kg 0.63 kg
Weight (Standard) 1 lb 3 oz 1 lb 4 oz 1 lb 6 oz
Width (Metric) 70 cm 72 cm 74 cm
Width (Standard) 27.5 in 28.5 in 29 in
Zipper side Left Left Left

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FAQs and Documents

Shipping and Returns

Free Shipping on Orders over $50

We offer complimentary FedEx Ground shipping for orders over $50. Learn More

Orders Shipped in 1-2 Days

We do our best to get all orders out within one business day, Monday through Friday. Learn More

No Hassle Returns

We accept returns within 30 days of purchase. All returned items must be in new condition. Please be sure no dirt, grass or pet hair is on the item you are returning. Learn More

Limited Lifetime Warranty

Every piece of Therm-a-Rest gear is designed to endure the rigors of your time in the backcountry. We offer a Limited Lifetime Warranty on all products, except electronic devices, which have a 2-year Limited Warranty. Visit our Therm-a-Rest warranty page for more info.

Portrait of our repair shop crew

Overall rating: 4.3333335 / 5 from 42 reviews.

AI Generated Review Summary

The Hyperion™ 20F/-6C Sleeping Bag is praised for its perfect fit across various body types, though some users report experiencing cold spots.

Summary topics

  • Fit: 18%
  • Cold Spots: 13%

Review topics: ["fit","size","weight","packs","weather","bag","quality","zippers","fabric","material","customer service","spot","air","light","hyperion","night","system","backpacking","space","temps","insulation"].

Review highlights

  • "The material feels amazing and it is a perfect fit for my 5'1" frame." — Dyan D.
  • "The snug fit means there is no dead air inside the bag with you." — Conner L.
  • "I am 1.73cm tall and quite slim and the sleeping bag fits well." — Matthias S.

Reviews

Perfect sleeping bag!

"Is a Life changing! I used it every time i go on trekking escape. Ultra lite and compact, that sleeping bag change the game. Its a reel confortable 0 degres."

— raphael b. (5/5)

Great bag. Used it so

"Great bag. Used it so many times under so many conditions and has been good to minus five comfortably."

— Dave M. (5/5)

Lightweight

"Amazing lightweight and warm. Zipper only goes down hallway of the bag could be a deciding factor for some."

— Dillon L. (5/5)

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!"

— Richard A. (5/5)

High Quality light weight material

"High Quality light weight material that packs very small"

— Parker B. (5/5)

Great bag, too short

"At 6' 4" I thought I would fit comfortably in this bag and while I just managed to fit my head in, it felt very tight and uncomfortable. I used this bag during my PCT thru hike and most nights i just slept with the hood off since it was more comfortable that way. When the temps got down I was forced to use the hood which made it quite tight. Love the hydrophobic down! Super light! The stuff sack that comes with the bag isn't the greatest, I used another compression sack."

— Chris (4/5)

Awesome!

"Light and super toasty!"

— John D. (5/5)

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."

— Conner L. (5/5)

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."

— Kevin C. (4/5)

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!"

— Ron C. (5/5)

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