Therm-a-Rest Space Cowboy 45 Sleeping Bag

Therm-a-Rest Space Cowboy 45 Sleeping Bag
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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.


  • eraLoft InsulationEfficient 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 quilts or tech blankets for increased warmth.
  • Additional features: Snag-free zipper and cinchable hood.
Height (Standard) 3.5 in 3.5 in
Fits (Standard) 72 in 78 in
Fits (Metric) 183 cm 198 cm
Weight (Standard) 1 lbs 4 oz 1 lbs 6 oz
Fill material eraLoft 120g 3D Hollow Polyester Fiber w/ ThermaCapture Lining, eraLoft 120g 3D Hollow Polyester Fiber eraLoft 120g 3D Hollow Polyester Fiber w/ ThermaCapture Lining, eraLoft 120g 3D Hollow Polyester Fiber
Weight (Metric) 0.57 kg 0.62 kg
Width (Standard) 28 in, 32 in 31.5 in, 32 in
Length (Standard) 73 in, 85 in 80 in, 85 in
Girth, Shoulder (Standard) 61.5 in 64.5 in
Girth, Shoulder (Metric) 156 cm 164 cm
Girth, Hip (Standard) 58 in 58.5 in
Girth, Hip (Metric) 147 cm 149 cm
Girth, Foot box (Standard) 44.5 in 49.5 in
Girth, Foot box (Metric) 113 cm 126 cm
Packed dimension (Standard)   7 in x 10 in 7 in x 10 in
Packed dimension (Metric) 18 cm x 25 cm 18 cm x 25 cm
EN Comfort (F) 52 F 52 F
EN Comfort (C) 11 C 11 C
EN Limit (F) 45 F 45 F
EN Limit (C) 7 C 7 C
EN Extreme (F) 21 F 21 F
EN Extreme (C) -6 C -6 C
Fill weight (Standard) 9 oz 10 oz
Fill weight (Metric) 0.27 kg 0.29 kg
Shell fabric 20D Polyester Ripstop w/DWR 20D Polyester Ripstop w/DWR
Liner fabric 20D Polyester Taffeta 20D Polyester Taffeta
Zipper side Left Left
Country of Origin China China


Therm-a-Rest Space Cowboy 45F/7C Sleeping Bag

Part Numbers

Option UPC MPN Store SKU
Ether / Long 040818102909 10290 SLE565444839