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The Mythic 400 sleeping bag is designed to deliver optimum warmth for minimum weight. Achieving an exceptional warmth to weight ratio, this bag retains all the features you need to stay warm and protected in cold mountain environments.
The Mythic 400 sleeping bag is designed to deliver optimum warmth for minimum weight. Achieving an exceptional warmth to weight ratio, this bag retains all the features you need to stay warm and protected in cold mountain environments.

Rab Mythic 400 Left Zip Down Sleeping Bag in Ink

£391.00 £460.00 15% off
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Rab Mythic 400 Left Zip Down Sleeping Bag in Ink

Season : AW21

Brand : RAB

Code : 5065711

The Mythic range of sleeping bags is the development of decades of experience from the very beginning. The award winning Mythic sleeping bags push design and innovation and are at the very peak of Rab's knowledge and craftsmanship.

Weighing in at 660g the Mythic contains 400g of the highest quality 900 fill power ethically sourced European goose down. Achieving an exceptional warmth to weight ratio, this bag retains all the features you need to stay warm and protected in cold mountain environments. The tapered mummy shape with angled foot box gives a generous fit for the weight. Weight saving baffle construction prevents down shift, while the chambers are angled downwards in chevrons keeping the down over the centre of the body to ensure core warmth throughout the night. Each bag is hand filled in Derbyshire, UK using Hydrophobic down developed in conjunction with Nikwax®.

Featuring an extreme temperature rating of -24°C (-11°F) and comfort of -1°C (30°F), the Mythic 400 uses the latest Pertex Quantum 7D inner and outer fabric and has a YKK zip and zip guard, inner collar and hood draw cord ensuring the sleeping bag withstands the challenges of moving fast and light in alpine environments. Super lightweight trims and features reduce weight, and the dry bag compression stuff sack provides protection from the elements and a smaller pack size while on the move. Every element of the Mythic 400 is designed to deliver optimum warmth for minimum weight.

  • Pack Size: 18 x 43cm/7 x 16.9in
  • EN ISO 23537-1:2016 Comfort: -1°C (30°F)
  • EN ISO 23537-1:2016 Limit: -6°C (21°F)
  • EN ISO 23537-1:2016 Extreme: -24°C (-11°F)
  • Rab® Limit: -7°C (19.5°F)
  • Max User Height: 185cm/72.8in
  • Shoulder Width: 70cm/27.5in
  • Hip Width: 52cm/20.5in
  • Foot Width: 41cm/16.0in
  • Weight: 660g/23.2oz
  • Pertex® Quantum 7 Denier Inner and Outer
  • 900 FP R.D.S Certified European Goose Down
  • Rab® Fluorocarbon free Hydrophobic Down developed in conjunction with Nikwax®
  • Weight saving baffle construction, preventing down shift/migration
  • Trapezoidal baffle chamber design
  • Mummy Taper Shape
  • Proportionally assigned differential cut
  • ½ length YKK 3 coil main zip with noctilucent puller
  • Anti snag bonded zip guard
  • Ergonomically designed internal collar
  • Internal collar and hood drawcord
  • Super lightweight trims and features
  • Angled foot box
  • Dry bag compression stuffsack
  • Cotton storage sack
  • Temperature tested to new European standard EN ISO 23537-1:2016
  • Available in left zip only
  • Also in the range: Mythic 200, Mythic 600
Technical Information


  • Rab® Hydrophobic Down offers the following benefits: Absorbs less water – Dries faster – Retains loft – Fluorocarbon free
Sizing Information
Tapered Mummy shaped- the performance option. Tapered mummy bags are the 'slim fit' of sleeping bags. These are close at the shoulders and tighter at the feet to reduce any excess air. They are the most thermally efficient option, pack the smallest and weight the least.Used in: Neutrino, Neutrino Pro, Mythic, Mythic Ultra, Alpine Pro

Mythic Sizing:

Regular Fit

Length: 215cm
User Height: 170-185cm
Shoulder Width: 70cm
Foot Width: 41cm
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  • Rab Mythic 400 Left Zip Down Sleeping Bag in Ink Review by Sam,  On 10/02/2020 20:56:02

    I used this for the first time last weekend for a solo Brecon Beacons wild camp. I didnt have the normal minus January temps but it was really damp and foggy. The water droplets were hanging in the air. My first time using hydrophobic down and I certainly noticed the difference how it copes with damp compared to my older untreated rab bag. The pertex shell on the mythic is so thin that you have to treat it with great care and Ive even found twice so far that sharp down quills can peirce through the material from the inside out which has never happened with my pertex endurance bag in 10yrs of use. That said the mythic is 130g lighter even though it contains 100g more down than my rab summit alpine 300 so is warmer. I was looking to buy the neutrino 400 initially but the mythic was on sale and came out cheaper. I think that maybe the neutrino would have a better balance between durability for slightly more weight and has the same temp ratings as the mythic. However I am happy with the bag so far except for the really small stuff sack which seems far too small and risks damaging the baffles cramming it in so am using something a bit larger.
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