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Thermarest Hyperion 20 UL Small Sleeping Bag

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Hyperion 20 UL Small Sleeping Bag

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Product ID: 1372919

Thermarest Hyperion 20 UL Small Sleeping Bag

Thermarest’s high-performance Hyperion 20 UL Small Sleeping Bag is ideal for smaller users, as there is less dead space to heat up, making it warmer quicker. The Nikwax treated 900 fill goose down lofts 60 times better than untreated down as it doesn’t absorb any moisture, making it a much more effective insulator. Just as key to its warmth is the use of box wall baffles and zoned fill, which puts more down where it is needed and less where it isn’t, maximising the warmth-to-weight ratio.

All the down used is Responsible Down Standard Certified so that the birds used in the manufacturing process are treated humanely. A compression stuff sack helps the sleeping bag be packed down very small when necessary so that it takes up as little space as possible in a pannier or rucksack, whilst the larger storage sack lets the down loft properly and maintain its effectiveness between trips.


  • 900 fill Nikwax Hydrophobic Down™: Stays drier and maintains loft 60 times longer than untreated down
  • Unrivalled packability: Lightweight materials and precise design allow for a smaller packed size than ever before
  • Box baffled construction: Uses mesh walls to maximise loft and minimise cold spots in key areas
  • Comfort fit: Ergonomic shape and longer zip provide a more human-friendly fit than other ultralight bags
  • SynergyLink™ connectors: Integrate the bag with a mattress for optimal efficiency and comfort; removable for versatility
  • Zoned insulation: Maximises warmth and saves weight by intentionally placing fill where it’s needed most, 70% on the top and sides with 30% on the back
  • Goose down
  • Responsible Down Standard Certified: Certification that ensures that the waterfowl in the down supply chain are treated humanely
  • Additional features: Snag-free zip and cinchable hood
  • Storage sack and compression stuff sack included
  • Left zip only
  • Width: 70cm
  • Length: 185cm
  • Fits: 168cm
  • Shoulder girth: 140cm
  • Hip girth: 123cm
  • Packed dimensions: 15cm x 20cm
  • Manufacturer’s claimed EN comfort rating: 0°C
  • Manufacturer’s claimed EN limit rating: -6°C
  • Manufacturer’s claimed EN extreme rating: -23°C
  • Fill weight: 330 grams
  • Manufacturer’s claimed weight: 550 grams

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