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Thermarest Space Cowboy 45F Long Sleeping Bag

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.


  • eraLoft Insulation: Efficient and compressible, our water-resistant synthetic fill uses hollow fibers to reduce weight without sacrificing warmth.
  • SynergyLink Connectors: Connectors: Integrate the bag with a mattress 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 keeps the Space Cowboy lightweight without sacrificing warmth.
  • Quilt and Blanket Loops: Customize your sleep system by layering our quilts or tech blankets for increased warmth.
  • Additional features: Snag-free zipper and cinchable hood.


  • Weight (Standard): 1 lbs 6 oz
  • Width (Standard): 32 in
  • Length (Standard): 85 in
  • Height (Standard): 3.5 in
  • Fits (Standard): 78 in
  • Girth, Shoulder (Standard): 64.5 in
  • Girth, Hip (Standard): 58.5 in
  • Girth, Foot box (Standard): 49.5 in
  • Packed dimension (Standard): 7 in x 10 in
  • EN Comfort (C): 11 C
  • EN Limit (C): 7 C
  • EN Extreme (C):  -6 C
  • Fill material: eraLoft 120g 3D Hollow Polyester Fiber
  • Fill weight (Standard): 9.5 oz
  • Shell fabric: Polyester Ripstop w/DWR
  • Lining fabric: Polyester Taffeta
  • Zipper side: Left