$399.95 to $439.95
Color:Deep Pacific
please select a Size
Choose a shipping method

Keep your pack featherweight without sacrificing an ounce of performance. The Therm-a-Rest Hyperion 20 down sleeping bag packs down small and keeps you cozy and comfortable on backcountry pursuits.

  • Features

    • 900-fill-power Nikwax Hydrophobic Down™ resists moisture and maintains loft up to 60 times longer than untreated down
    • Lightweight materials and precise design allow for a small packed size
    • Thermally efficient box baffled construction uses mesh walls to maximize loft and minimize cold spots in key areas
    • Ergonomic shape and long zipper provide a human-friendly fit
    • SynergyLink™ Connectors integrate the bag with a mattress (not included) for optimal efficiency and comfort; removable for versatility
    • 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
    • Shell fabric has been treated with a durable water repellent (DWR) to resist moisture
    • Storage sack and compression stuff sack included
    • Responsible Down Standard certification ensures that the waterfowl in the down supply chain are treated humanely
    • Backpacker magazine awarded this sleeping bag a 2019 Editors' Choice Award


    View all Therm-a-Rest Men's Sleeping Bags
  • Technical Specs

    Best Use


    Tested Lower Limit

    20 degrees (F) - ISO

    Tested Comfort

    32 degrees (F) - ISO

    Temperature Rating (F)

    20 degrees (F)

    Temperature Rating (C)

    -6 degrees (C)


    Long: 1 lb. 6 oz.

    Small: 1 lb. 3 oz.




    Ripstop nylon

    Zipper Location


    Insulation Type


    Water-Resistant Down



    900-fill-power Nikwax Hydrophobic goose down

    Fill Weight

    Long: 14 ounces

    Small: 12 ounces


    Ripstop nylon

    Sleeping Bag Shape


    Fits Up To (in.)

    Long: 78 inches

    Small: 66 inches

    Shoulder Girth (in.)

    Long: 58 inches

    Small: 55 inches

    Hip Girth (in.)

    Long: 51 inches

    Small: 48.5 inches

    Stuff Sack Size

    6 x 8 inches

    Stuff Sack Volume

    3.5 liters

    Compressed Volume

    3 liters




    Down certified to the Responsible Down Standard (RDS)

  • Reviews

    Loading Reviews...
  • Questions & Answers

    Loading Questions...