Mythic Down Sleeping Bag (-12°C)

CA$975.00

Size and shape guide

Shape: Tapered Mummy

Size guide

Shape guide

Dimensions

Metric (cm)

Imperial (in)

Measurements	Regular	Long
Sleeping bag length	215cm	230cm
Max user height	185cm	200cm
Internal shoulder girth	160cm	162cm
Internal hip girth	134cm	136cm
Internal foot girth	102cm	104cm

Measurements	Regular	Long
Sleeping bag length	85 in	91 in
Max user height	73 in	79 in
Internal shoulder girth	63 in	64 in
Internal hip girth	53 in	54 in
Internal foot girth	40 in	41 in

Wide Mummy

A more generous cut for added comfort while you sleep, with space to move your legs. These sleeping bags are slightly bulkier and heavier than our mummy taper shape, but allow a more relaxed sleeping position.

Mythic Down Sleeping Bag (-12°C)

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Mythic Down Sleeping Bag (-12°C)

CA$975.00

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Delivery and returns Delivery
Rab Promise

Our Mythic sleeping bags redefine warmth for weight, meticulously shaving grams and minimising pack size to bring you performance without penalty.

Ultralight. Heat Reflective TILT.

Activities:
Fast & light adventures
Trekking

Shape:
Tapered Mummy
Size Guide

Weight:
920g/2lb 0.45oz

Packed size:
20cm x 35cm (7.9in x 13.8in)

This unique guarantee promises to support you before, during and after your adventure, combining gear advice, aftercare services, and our Rab Warranty, to help you get more out of your gear.

For more information, please visit our Rab Promise page.

Features

Weight920g/2lb 0.45oz
Insulation900FP European goose down with Grangers fluorocarbon-free hydrophobic finish (590g / 20.8oz)
Main fabric10D Pertex® Quantum ripstop (26g/m²) with fluorocarbon-free DWR
Fabric lining10D Recycled Atmos™ (28gsm) with Thermo Ionic Lining Technology (TILT)
ISO (23537-1:2022) temperature ratingComfort: -5°C (23°F), Limit of comfort: -12°C (10°F), Extreme: -33°C (-27°F)
Limit of Comfort-12°C / 10°F
Packed size20cm x 35cm (7.9in x 13.8in)
Product codeQSN-26

Every detail of the Mythic has been designed to reduce weight and bulk, drawing on over 40 years of hard-won expertise. It’s filled with high-quality 900FP down, which offers superb warmth for its weight, in our groundbreaking L.O.F.T 3D™ construction. This unique technology uses twisted, helix-shaped baffles to create funnel points within the bag, which prevent down from migrating and keep it evenly distributed. Combined with a TILT lining that reflects heat back towards your body, this allows us to achieve an unrivalled warmth-to-weight ratio. Light on grams but not on functionality, the Mythic is finished with a Pertex® Quantum ripstop fabric to ensure it stands up to mountain environments. Ultralight, stripped-back, and uncompromisingly warm, it’s ideal for moving fast in cold conditions, from fastpacking to alpinism.

Hand-filled in the UK, all our down bags benefit from never having had their down compressed before use, preserving its loft and warmth.

Pioneering L.O.F.T 3D™ construction features helix-shaped baffles that prevent down migration and maximise warmth retention.
Built with a heat-reflective TILT lining, minimising radiant heat loss for virtually no extra weight.
Sleep comfortably on your side thanks to the sidewall baffles, which reduce cold spots and ensure you’re not lying on a seam.
Cinch in the hood to seal in the heat, while the down-filled collar sits snugly around your neck.
The tapered mummy shape is incredibly efficient on pack size.
½ length zip features an insulated zip baffle to prevent cold spots when the temperature drops.
Internal cordlocks positioned below your collar bone for greater side sleeping comfort.
Anatomically shaped foot box allows you to sleep in a relaxed position.
Lightweight dry bag compression stuff sack.
Zipped storage sack with water-resistant base for home storage.
Hand-filled in Derbyshire UK.

Material Facts

Mythic Down Sleeping Bag (-12°C)

	Recycled	PFAS PFAS This column shows where fluorocarbons (PFAS) may still be present in our products. No PFAS means we’ve phased out all intentionally added PFAS from the corresponding component and are compliant with current EU and US legislation.
Total content Total content The total percentage of an item's weight that is recycled.	31%	No
Fabric Fabric Some of our products use multiple fabrics, especially waterproof items. This figure shows the total percentage of an item's fabrics which are recycled, calculated by weight.	99%	No
Outer	100%	No
Liner	99%	No
Hydrophobic down	0%	No
Zips Zips This figure includes zipper tape, teeth, sliders, and pullers, showing their total recycled content by weight.	83%	No
Trims Trims This section shows the recycled content by weight for all components added to our products that are not captured in the other categories. For example, cord locks, pocket linings, buttons, cords, size labels, and eyelets.	43%	No
Renewable energy
Product manufacturing	42%
Manufactured in China
*Calculations based upon the weight of a regular length sleeping bag.
QSN-26 Version 09/2025

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We’re helping you to make informed choices by giving you the raw data. Clear. Concise. Honest.

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Tech and features.

Hand-filled in the UK, all our down bags benefit from never having had their down compressed before use, preserving its loft and warmth.

Features

Weight920g/2lb 0.45oz
Insulation900FP European goose down with Grangers fluorocarbon-free hydrophobic finish (590g / 20.8oz)
Main fabric10D Pertex® Quantum ripstop (26g/m²) with fluorocarbon-free DWR
Fabric lining10D Recycled Atmos™ (28gsm) with Thermo Ionic Lining Technology (TILT)
ISO (23537-1:2022) temperature ratingComfort: -5°C (23°F), Limit of comfort: -12°C (10°F), Extreme: -33°C (-27°F)
Limit of Comfort-12°C / 10°F
Packed size20cm x 35cm (7.9in x 13.8in)
Product codeQSN-26

Hand-filled in the UK, all our down bags benefit from never having had their down compressed before use, preserving its loft and warmth.

Pioneering L.O.F.T 3D™ construction features helix-shaped baffles that prevent down migration and maximise warmth retention.
Built with a heat-reflective TILT lining, minimising radiant heat loss for virtually no extra weight.
Sleep comfortably on your side thanks to the sidewall baffles, which reduce cold spots and ensure you’re not lying on a seam.
Cinch in the hood to seal in the heat, while the down-filled collar sits snugly around your neck.
The tapered mummy shape is incredibly efficient on pack size.
½ length zip features an insulated zip baffle to prevent cold spots when the temperature drops.
Internal cordlocks positioned below your collar bone for greater side sleeping comfort.
Anatomically shaped foot box allows you to sleep in a relaxed position.
Lightweight dry bag compression stuff sack.
Zipped storage sack with water-resistant base for home storage.
Hand-filled in Derbyshire UK.