Rab - Mythic 400 Down Sleeping Bag

I bought this bag some 1.5 year ago, and have since made >20 weeks in it, from april in the Pyrenees to summer high in the Alps, to november at sealevel, so I thought I’d share with y’all how its been. Ive not seen any posts about this bag on the subreddit yet, which surprised me as ive gotten good use from it. Some stats: 400gr of 900c hydrophobic goosedown, -1 comfort, -6 limit rated at 660grams. For good measure, I paired it with the nemo tensor insulated R4.3, and am 5’10, narrow build. Now to the review. One of the main bonus points i got from this bad was the comfort it supplied at this weight. Footbox is not too narrow, enough room for side sleepers to twist around. An extra added rim of down around the shoulders added a ton of extra warmth, and featured a convenient pocket for eg your batteries. I should say however that when fully zipped and with the hood up, i couldnt easily get my arms out, which was a minor annoyance. Despite the ultralight (slightly shear) material, it felt quite sturdy and is not showing signs of wear after these 20 weeks. No issues of it getting caught in the zipper either. The 20 weeks of heavy use are really not visible/noticeable at all. Full length zipper was great in warmer weather. As for the temperature rating, this is where I have some doubts. I should say however that I am a VERY cold sleeper (plus was solo, so no other person as heat source). At ~5 degrees i started to feel chilly wearing thermos trousers and shirt+fleece. I have pushed the bag some below freezing, at which point I felt chilly throughout the night, even with stuffing my down jacket in my bag. Wearing thermo underlayers, my “comfort” temperature was more around 8-9 deg. So to conclude, i truly love this bag for its comfort and weight/durability. I do however doubt the warmth rating. Which makes me curious if other people with this/ a similar bag feel cold at these temps. Tnx for reading and do ask if you have questions :)

I have a Rab Mythic 400 and I really like it. I have used it around freezing and been warm. I did the TMB in a 30F different bag last September and I was a bit chilly so I got the Rab and it was better than the 30F bag. I know this isnt really definitive data but I was happy.

I have a Rab Mythic 400 (I think) it's a 20F bag so a little warmer but it's just over a pound or .5 Kg and I am real happy with it. Its real warm.

This is my ultralight setup: Ultralight-Setup: • Tent: MSR Hubba Hubba • Sleeping Pad: Therm-a-Rest NeoAir XTherm NXT (R-Value 7.3) • Sleeping Bag: Rab Mythic G (900+ FP Down)