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Off-Mountain Layers, Footwear & Accessories | Shop Now

Therm-a-RestHyperion Sleeping Bag: 20F Down

Therm-a-RestHyperion Sleeping Bag: 20F Down

$469.95 - $529.95
Select a color:Deep Pacific

Select a size:


4 out of 5 stars
8 Reviews

Why We Like The Hyperion Sleeping Bag

Slide the featherlight Therm-a-Rest Hyperion Sleeping Bag into your trusty backpacking pack before a long thru-hike. The lightweight and packable construction of this sleeping bag will ensure there is plenty of room in your pack for other necessities. The 900-fill Nikwax Hydrophobic Down makes this warmth and packability possible by trapping your body heat in strategic areas and compressing to an impressively small size. As an added bonus the Nikwax treatment means the down can handle moisture without losing its loft so that a surprise rainstorm won't ruin your trip. This bag also features an ergonomic shape and longer zipper that makes it far more comfortable than some competitor's bags in the ultralight category.


  • Lightweight and packable bag built to keep you on the move
  • 900-fill Nikwax Hydrophobic Down maintains loft when moist
  • 20F rating keeps you comfortable even when the temperature drops
  • Zoned insulation organizes down to minimize weight, maximize warmth
  • SynergyLink connectors hold your pad in place while you roll over
  • Precise design increases packability to keep your load organized
  • Ergonomic shape and longer zipper boost the comfort of this bag
  • Item #CAS00EO

Tech Specs

10D nylon ripstop (DWR coating)
900-fill Nikwax Hydrophobic Down
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
Pad Retainer
SynergyLink Connectors (removable)
Fill Weight
[small] 11.5oz, [regular] 12.5oz, [long] 14oz
European Norm/ISO Comfort Rating
European Norm/ISO Lower Limit Rating
Storage Sack
Stuff Sack
Stuff Size
6 x 8in
Claimed Weight
[small] 1lb 3oz [regular] 1lb 4oz [long] 1lb 6oz
Manufacturer Warranty

Overall Rating

4 based on 8 ratings

Review Summary

5 Stars - 3 reviews
4 Stars - 3 reviews
3 Stars - 1 reviews
2 Stars - 1 reviews
1 Stars - 0 reviews

Fits 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.
Runs smallTrue to sizeRuns large

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