Therm-A-Rest Hyperion
Best ultralight sleeping bag for minimalist long distance backpackers.
This ultralight mummy bag prioritizes weight savings without compromising on warmth. By utilizing high-loft hydrophobic down and a zoned insulation pattern, it delivers an efficient, packable sleep system for long-distance treks and minimalist adventures.
$519.95
Who it's for
- Ultralight backpackers prioritizing minimal pack weight and high thermal efficiency
- Thru-hikers and minimalist travelers with limited internal pack volume
- Active sleepers who frequently roll off their sleeping pads
Who should skip it
- Broad-shouldered hikers or sleepers who prefer extra room to move
- Rough users or those camping in abrasive, high-wear conditions
- Warm sleepers who need versatile ventilation options for varying temperatures
Performance breakdown
Weight Efficiency
Featherlight construction makes this an elite choice for ultralight backpacking.
Thermal Retention
High-loft down and zoned insulation trap heat exactly where needed.
Moisture Resistance
Hydrophobic down treatment keeps insulation effective even in damp backcountry conditions.
System Integration
SynergyLink connectors keep you securely centered on your sleeping pad all night.
Packability
Compresses down to a tiny footprint, saving precious space in your pack.
Ergonomic Comfort
Streamlined mummy shape maximizes efficiency but may feel snug for some.
Key Specs
Weight
1 lb
Temperature Rating
32 degrees Fahrenheit
Insulation Type
900-fill Nikwax Hydrophobic Down
Sleeping Bag Shape
Mummy
Water Resistant
Yes
Fill Power
900 cubic inches per ounce
Know before you buy
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