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  • Mythic 400 Down Sleeping Bag (-6C)

 
 

Mythic 400 Down Sleeping Bag (-6C)

£460.00

Ultra-lightweight with a highly tapered cut, the Mythic 400 is designed for alpine style missions where weight and pack size are crucial to success. Filled with 900FP goose down and covered with a lightweight Atmos™ ripstop fabric, it's a high-performance bag for those meticulously counting grams.

Weight : 660g / 23oz
Rab Sleep Limit : -6C / 20F
Pack Size : 35 x 23cm / 13.8 x 9.1 inches
Ultralight
Packable

Sleeping Bag Size Guide

Tapered Mummy Regular
Sleeping Bag Length 215cm / 84.6 in
Max User Height 185cm / 72.8 in
Internal Shoulder Girth 160cm / 63.0 in
Internal Hip Girth 134cm / 52.8 in
Internal Foot Girth 102cm / 40.2 in
Pack Size 35cm x 23cm
 
New for this season. This style will be available soon!
Mythic 400 Down Sleeping Bag (-6C) £460 Sizing
£460

How it Performs

Lightness

Light Ultralight

Pack Size

Moderate Pack Size Ultra Low Pack Size

Environment Use

Cold Extreme Cold
i

These ratings compare our products to each other. All our products, at any rating, are of the highest quality.

How it Performs

Lightness

Light Ultralight

Pack Size

Moderate Pack Size Ultra Low Pack Size
i

These ratings compare our products to each other. All our products, at any rating, are of the highest quality.

What It's Best For

Mountaineering
Fast & Light Adventures

Behind the Design

Find out about the fabrics and features that make this gear unique.

Play Video

What is hydrophobic down?

We finish all our down with a hydrophobic treatment that enables it to retain its loft in damp conditions, so that your gear dries fast and stays warm. Find out how it works.
*With the exception of our 1000FP down.

What is hydrophobic down?

We finish all our down with a hydrophobic treatment that enables it to retain its loft in damp conditions, so that your gear dries fast and stays warm. Find out how it works.
*With the exception of our 1000FP down.

Atmos™ Fabric

Packable and fast drying, with high water resistance, Atmos™ protects from the weather on mountain adventures. Made using super-fine yarns in a tight construction it's durable and windproof. 

Atmos™ Fabric

Packable and fast drying, with high water resistance, Atmos™ protects from the weather on mountain adventures. Made using super-fine yarns in a tight construction it's durable and windproof.

Rab Sleep Limit Explained

Need help choosing the right bag for your next adventure? This is our real-world assessment of a sleeping bag's usable temperature limit. Find out how we arrive at this rating and how you can use it to select your bag.

Rab Sleep Limit Explained

Need help choosing the right bag for your next adventure? This is our real-world assessment of a sleeping bag's usable temperature limit. Find out how we arrive at this rating and how you can use it to select your bag.

Mythic Collection

With the highest warmth to weight ratio in the Rab range, the Mythic sleeping bags are optimised for moving fast and light. Combining advanced fabric technologies with our highest lofting down and slashing unnecessary grams with pioneering design.

Mythic Collection 

With the highest warmth to weight ratio in the Rab range, the Mythic sleeping bags are optimised for moving fast and light. Combining advanced fabric technologies with our highest lofting down and slashing unnecessary grams with pioneering design.

RDS Certified Down

The Responsible Down Standard independently certifies down against animal welfare requirements and tracks it from the source to the final product.

RDS Certified Down

The Responsible Down Standard independently certifies down against animal welfare requirements and tracks it from the source to the final product.

Tell Me More

The Mythic range is all about slashing weight wherever possible. The Mythic 400 is an extremely lightweight, three season bag. At home in high mountains, it’s ideal for venturing out long Alpine routes, multi-day climbs, treks or bike packing adventures.

Weighing in at just 660g, it contains 400g of 900FP, goose down. The chevron style baffle design keeps the down in position, optimising core warmth and reducing the amount of fabric needed compared to traditional horizontal baffles. The outer is made from our own wind and water-resistant, Atmos™ fabric. At just 7D with a built-in ripstop, it’s both ultra-light and super tough. It has a narrow mummy shape to minimise bulk, lightweight zips and pullers, and comes with a lightweight, waterproof, roll top compression sack for protection from the elements and a small pack size while on the move.

The trapezoid boxwall baffle construction allows the down to fully loft, eliminates cold spots, and maximises warmth. It has an additional, adjustable baffle around the neck and an internal baffle along the length of the zip, both designed stop the heat from escaping. Hand-filled in the UK, all our down bags benefit from never having had their down compressed before use, maintaining the down’s loft and warmth.

The Specifics

  • Rab Sleep Limit:Rab Sleep Limit: -6°C (20°F)
  • Weight:660g/23.3oz
  • EN (13537:2012) Temperature rating:ISO EN: Comfort: -1°C (30°F), Limit: -6°C (21°F), Extreme: -24°C (-11°F)
  • Product Code:QSI-37
  • 7D Atmos™ nylon ripstop (23gsm) \ DWR
  • Lining: 7D Atmos™ nylon ripstop (23gsm) \ DWR
  • 900FP R.D.S Certified European Goose Down with Nikwax fluorocarbon-free Hydrophobic Finish
  • Weight saving chevron baffle design, reduces down migration and optimises core warmth.
  • Trapezoidal boxwall construction with differential cut, to maximise loft and warmth
  • Close fitting adjustable neck baffle design for decreased heat loss
  • YKK 3/4 length main zip with synthetic filled baffle to trap warmth
  • YKK zipped internal stash pocket
  • Angled foot box for relaxed sleeping posture
  • Anti snag internal zip guard
  • Hand-filled in Derbyshire UK
  • Zipped cotton sack with water-resistant base for home storage
  • Lightweight waterproof roll-top compression sack included
  • 100% polyamide
  • Tapered Mummy Shape

Sleeping Bag Size Guide

Tapered Mummy Regular
Sleeping Bag Length 215cm / 84.6 in
Max User Height 185cm / 72.8 in
Internal Shoulder Girth 160cm / 63.0 in
Internal Hip Girth 134cm / 52.8 in
Internal Foot Girth 102cm / 40.2 in
Pack Size 35cm x 23cm

It's In Our DNA

A Climate Neutral Company

We're reducing our carbon footprint while balancing any remaining emissions through carbon credits. It's not a final solution, but we believe in taking accountability for today's emissions while we reduce tomorrow's

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Fair Wear

We're working to make the garment industry fairer. We're dedicated to supporting garment workers' rights to safe, dignified and properly paid employment. Making garment production fairer for everyone.

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Rather repair than replace?

The Rab Service Centre is here to keep your gear in action, reducing waste and making more memories in the process. Find out if we can help you with a repair now.

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Our Ascent to Net Zero

We're committed to becoming a Net Zero business by 2030. We'll reduce all unnecessary carbon emissions from our business operations and will offset any that are left.

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Mythic 400 Down Sleeping Bag (-6C) Reviews

Shipping

Rab ships throughout the UK, EU and the United States. All UK orders are shipped free of charge by DPD. Orders placed during the week and before midday will typically be delivered within 48 hours, orders placed on weekends will ship on the following Monday.

For more information regarding shipping, including shipping charges and estimated delivery times, please visit our help centre.

Returns

If you are unhappy with your purchase, please return it to us within 28 days of receipt. The item(s) must be in resalable condition with tags attached. We are currently unable to exchange items and will refund products returned to us under the policy above.

Please note, we are not able to accept returns for underwear unless the product is faulty or damaged. We advise that you use a recorded courier service to return your item(s) as we cannot be responsible for items lost in the post.

For more information regarding returns and warranty, please see our help centre.