Therm-A-Rest Space Cowboy 45

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Built to explore the last frontier, the lightweight Space Cowboy is a favorite for summer backpackers and cowboy campers.
The feather-weight Space Cowboy is built with eraLoft synthetic insulation to endure the rigors of backpacking and cowboy camping in variable conditions. Designed with innovative Therm-a-Rest features like SynergyLink Connectors and Zoned Insulation, the bag is among the lightest and most packable in its class. The mummy-style bag compresses down to take up minimal room in your pack and comes in two outdoor-inspired colors. Whether exploring the western frontier, bike packing through the desert or wandering through the wild, the Space Cowboy has you covered. Storage sack and compression stuff sack included.


  • Efficient, compressible eraLoft™ insulation is water-resistant synthetic fill that uses hollow fibers to reduce weight without sacrificing warmth
  • SynergyLink Connectors ™ integrate the bag with a mattress (not included) for optimal comfort and efficiency; removable for versatility
  • Zoned insulation maximizes warmth and saves weight by intentionally placing fill where you need it most, placing 65% of the fill on top and 35% on the bottom
  • Quilt and blanket loops let you customize your sleep system by layering quilts or tech blankets (not included) for increased warmth
  • Shell fabric has been treated with a durable water repellent (DWR) to shed moisture
  • Cinchable hood keeps warmth in
  • Snag-free zipper
  • Storage sack and compression stuff sack included

    Technical specs

    Best Use
    Tested Lower Limit
    45 degrees (F) - ISO
    Tested Comfort
    52 degrees (F) - ISO
    Temperature Rating (F)
    45 degrees (F)
    Temperature Rating (C)
    7 degrees (C)
    Long: 1 lbs. 6 oz.
    Regular: 1 lbs. 4 oz.
    Small: 1 lbs. 2 oz.
    Ripstop polyester
    Zipper Location
    Insulation Type
    120g eraLoft 3D hollow-fiber polyester
    Fill Weight
    Long: 10 ounces
    Regular: 9 ounces
    Small: 9 ounces
    Polyester taffeta
    Sleeping Bag Shape
    Fits Up To (in.)
    Long: 78 inches
    Regular: 72 inches
    Small: 66 inches
    Shoulder Girth (in.)
    Long: 64.5 inches
    Regular: 61.5 inches
    Small: 56.5 inches
    Hip Girth (in.)
    Long: 58.5 inches
    Regular: 58 inches
    Small: 56.5 inches
    Stuff Sack Size
    7 x 10 inches
    Stuff Sack Volume
    3 liters
    Compressed Volume
    2 liters
    Down certified to the Responsible Down Standard (RDS)

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