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Mythic Ultra 360 Sleeping Bag: 20F Down

5 out of 5 stars
4 Reviews
$385.00 - $770.00
Up to 50% off



Mythic Ultra 360 Sleeping Bag

The Mythic Ultra 360 fits into Rab’s sleeping bag line as a general use sleeping bag with an industry-leading weight to warmth ratio. The bag’s 900 down fill is impressively warm on cool desert nights and while weighing in under two pounds, this bag can truly go anywhere.


  • Featherweight bag combines cutting edge materials to supply reliable warmth
  • Mummy shape offers plenty of room for adjustments and warmth to the feet
  • Included stuff sack is easy to store and pack so you can bring it anywhere
  • Anti-snag bonded zip guard provides ease of use without added bulk
  • Item #RABZ06G
7D ripstop nylon
900+ FP RDS Certified European Goose Down
left zip only, 1/8 length YKK, anti-snag zip guard
Max User Height
[regular] 63in, [long] 63.8in
Shoulder Circumference
[regular] 63in, [long] 63.8in
Hip Circumference
[regular] 52.8in, [long] 53.5in
Foot Circumference
[regular] 40.2in, [long] 40.9in
Bag Length
[regular] 84.6in, [long] 90.6in
Pad Retainer
Storage Sack
Stuff Sack
dry bag compression
Stuff Size
14.2 x 7in
Claimed Weight
1lb 5.3oz
backpacking, weekend camping
Manufacturer Warranty

Overall Rating

5 based on 4 ratings

Review Summary

1 Stars - 0 reviews
2 Stars - 0 reviews
3 Stars - 0 reviews
4 Stars - 0 reviews
5 Stars - 4 reviews

Fits True To Size

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What do you think about this product?


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5 out of 5 stars

May 21, 2024

Tardis RAB Bag

The first thing that strikes you taking the bag from its dry bag (nice touch) is the immense loft from something so small in size. It kept filling up beyond what I thought possible. Next is the quality. It might be ultra light weight, but every element feels just right. The bag reduces grammes in several techy ways, but it's the shiny interior that stands out. Imagine a breathable cloth version of one of those emergency foil blankets they throw round marathon runners as they finish. Warmth is excellent. First time out was -8°C which is right at the edge of what RAB says is meant to be perfectly comfortable and - yes! - I'd say that was a cautious rating. The baffles and drawstrings are simple and the zip is small, but I found these all worked intelligently and was a good balance for what is a seriously featherweight bag. I'm struggling to find a negative in the bag itself. Price is expensive, but it's a RAB bag you're buying - and top of the line.

Mark F.

Originally reviewed on Rab

5 out of 5 stars

April 4, 2021

I can't believe how light

I can't believe how light and yet well constructed this product is. The technology is amazing, although I am yet to try it out so I can't comment on its warmth overnight.....

Cathie H.

Originally reviewed on Rab

5 out of 5 stars

June 16, 2020

Awesome Sleeping Bag

I've used it once or twice and have initial impressions
Size Bought:
5' 73"

What makes this bag stand out from the rest is the reflective soft shell on the inside. It increases the overall temp inside and this has allowed the company to take out some of the down filling and yet still maintain the same temp rating of a heavier sleeping bag. Very nice and soft inner shell. Very light and compressible just as advertised. I wish I could post more pictures but seems like I am only allowed one photo for this review. I haven°°t used it yet but I can tell this bag is going to keep me toasty. I own both the 180 and 360 versions and I could fit in both of them at the same time. This way I can increase the temp rating by a lot. Comes with a storage sack and the small stuff sack which is water proof. It actually is an ultralight dry bag. Even if your backpack somehow gets wet, your sleeping bag will stay completely dry. The 360 comes with a waist level zipper, while the 180 only shoulder level zipper. So keep that in mind when purchasing. Again: highly recommend this bag ! Buy it. Worth every penny !

user image
Aurel D
5 out of 5 stars

May 4, 2020

Ultra light and warm as

Ultra light and warm as advertised, worth every penny.

Paul V.

Originally reviewed on Rab