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Rab Mythic 400 Sleeping Bag: 21F Down


Get up to get down.

Your Rab Mythic 400 21 Degree Down Sleeping Bag won't drag you up the steep 10,000-foot slope to your summit, but it will make sure you get a solid night of sleep beforehand. Rab stuffed this lightweight bag with 900-fill hydrophobic down, a toasty combination that holds its insulation power even when you accidentally track snow into your tent. Pertex Quantum 7D fabric can withstand high alpine wear and tear and the compression stuff sack packs this bag down small so it's easy to haul between multiple camps.

  • A warm sleeping bag for going fast and light
  • Hyrdophobic down stays warm when when
  • 21-degree EN lower limit rating is great for chilly nights
  • Pertex Quantum fabric is super durable
  • 900-fill down is ultra toasty
  • Easy to pack at just over 1 pound
  • Compression and stuff sack included for easy storage
  • Item #RAB00HE

Pertex Quantum 7D (100% nylon)
900-fill down, RDS hydrophobic
European Norm Comfort Rating
30 F
European Norm Lower Limit Rating
Storage Sack
Stuff Sack
Stuff Size
7in x 17in
Claimed Weight
1lb 7oz
Recommended Use
backpacking, mountaineering, winter camping
Manufacturer Warranty

Tech Specs

What do you think about this product?


>Rating: 5

Ultralight and True to Rating

I've used it several times

First of all, I would encourage you to a disregard the review below. The person writing that review clearly is missing some critical backcountry knowledge if they got cold in this bag at 38 degrees. I’ve taken this bag down to 15 degrees with a liner in the Andes and have used it in the 30s in British Columbia without issue. Let’s be clear: If you want to take this bag down towards the 20-30 range you need a winter pad like the Xtherm and you need to cinch down the draft collar all the way and use the hood and wear appropriate clothing like long johns and a hat. Having a full zip draft free experience with a draft collar and a hood makes this better choice for alpine use versus the UL quilt options that don’t have hoods or zippers to block drafts.

>Rating: 3

comfort rating is not accurate

I've used it several times

I recently purchased this bag in August and did a 4 nighter in the Ansel Adams wilderness in mid August at elevations of roughly 9800-10,000 ft. The average nightly temps didn't dip below 38 f. However, I was cold from 3 am to 6 am every night. I put on every layer, pants, socks and my light down jacket and was barely warm enough. Its a gorgeous bag, well made, super light and well appointed with the neck baffles. But be aware that it may not be warm enough for you.