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Thermarest Questar -0C Baslam Sleeping Bag

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The Thermarest Questar -0C Baslam Sleeping Bag is for the comfort-conscious backpacker. It blends comfort features with a backcountry-friendly packed size.

As the lightest bag in our award-winning Questar line, this bag makes the perfect partner for experiencing the joy of the backcountry.

  • 650 fill Nikwax Hydrophobic Down: Stays drier and maintains loft 60 times longer than untreated down.
  • SynergyLink Connectors: Integrate the bag with a mattress for optimal comfort and efficiency; removable for versatility.
  • Zoned Insulation: Maximises warmth and saves weight by intentionally placing fill where you need it most.
  • Quilt and Blanket Loops: Customise your sleep system by layering our quilts or tech blankets for increased warmth.
  • W.A.R.M. Fit: With Additional Room for Multiple positions (W.A.R.M.) fit means this bag allows for various natural sleep positions while maintaining thermal efficiency.
  • Toe-asis Foot Warmer Pocket: Ergonomic toe box that rapidly warms cold feet in a pocket of warm down.
  • Responsible Down Standard Certified: Certification that ensures that the waterfowl in the down supply chain are treated humanely.
  • Box Baffled Construction: Uses mesh walls to maximise loft and minimise cold spots.
  • Additional features: Heat-trapping draft collar, full-length zipper draft tube, snag-free zipper, cinchable hood and external zip pocket.
  • Comfort: 5 C
  • Limit: 0 C
  • Extreme: -15 C
  • Fill: 650 Fill Nikwax Hydrophobic Down, RDS
  • Fill weight: 370 g
  • Shell fabric: 20D Polyester Ripstop w/DWR
  • Liner fabric: 20D Polyester Taffeta, Printed
  • Zipper: side Left


  • Fit: 168 cm
  • Weight: 764g
  • Width: 74 cm
  • Length: 185 cm
  • Girth, Shoulder: 147 cm
  • Girth, Hip: 147 cm
  • Girth, Foot box: 112 cm
  • Foot Width: 56 cm


    • Fit: 183 cm
    • Weight: 849 g
    • Width: 80 cm
    • Length: 201 cm
    • Girth, Shoulder: 160 cm
    • Girth, Hip: 156 cm
    • Girth, Foot box: 127 cm
    • Foot Width: 58 cm


    • Fit: 198 cm
    • Weight: 881 g
    • Width: 84 cm
    • Length: 216 cm
    • Girth, Shoulder: 168 cm
    • Girth, Hip: 163 cm
    • Girth, Foot box: 130 cm
    • Foot Width: 65 cm