Rab Mythic 400 Sleeping Bag

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The Mythic 400 is an exceptional choice for ultra-light mountain endeavours. Clocking in at just 660 grams yet offering solid three-season performance, its impressive stats are a result of premium materials and precision design combined. The thermal efficiency of the 900-fill hydrophobic down is enhanced through the trapezoidal baffles of the box wall construction, resulting in a warm yet light and compressible sleeping bag. When you need to cut weight without sacrificing comfort on your next mountain mission, be sure to choose the Mythic.


  • Lightweight Pertex Quantum 10 denier inner and outer
  • Chevron shaped chambers efficiently stabilise the down, removing risk of down movement and cold spots
  • Box wall construction with trapezoidal baffle design maximises thermal efficiency
  • Down-filled ergonomic neck baffle seals in the heat
  • Internal collar and hood drawcord
  • ½ length two-way zip allows venting in both upper and lower areas
  • Glow-in-the-dark zip pulls
  • Integrated anti-snag strip helps prevent zip catching on fabric
  • Tapered mummy shape with an angled foot box
  • Ultralight hanging loops for airing, drying or vertical storage
  • Dry bag compression stuff sack
  • Cotton storage sack
  • Hand filled in Derbyshire, UK


  • Insulation: 900 fill Hydrophobic Responsible Down Standard (RDS) goose down
  • Fill weight: 400g
  • Total weight: 660g
  • Max user height: 185cm
  • Shoulder width: 70cm
  • Pack size: 32cm x 21cm
  • Available in left hand zip only

EN Temp ratings (comfort/limit/extreme): -1°C /-6°C/-24°C