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First Look: Rab Mythic Ultra 360 Sleeping Bag

By

Gavin Hess

Made with 900 fill down: the Rab Mythic Ultra 360 Down Sleeping Bag (18°F).

Made with 900 fill down: the Rab Mythic Ultra 360 Down Sleeping Bag (18°F).

  Down, lightweight nylon, baffles, usually a zipper… the sleeping bag world is generally pretty simple: how much down and how high of a fill power, how light of a nylon can you use, where you cut corners on things like girth or zipper length all add up to a weight and warmth to be…

Responses

  1. Travis

    I’ve been considering getting a Rab jacket with a TILT lining, does that interfere with a beacon? It’s a down jacket so maybe not that big of a deal, but I’m still curious.

    1. Gavin Hess

      This is an excellent question – I worry that it may… As I recall, “anything metallic” or reflective will cause interference. To what degree, I don’t know. I’ll do a little fiddling with this to see if I can get a better answer.

      We just got in a Mythic Ultra (I think) jacket, sans TILT lining, it looks awesome.

      1. Travis

        Thanks, Gavin! Appreciate it. Can’t wait to hear about the jacket as well.

  2. Jason Albert

    Hey Travis, our article on the UIAA and EMI was on my mind (CAIC used the link in their newsletter yesterday). The UIAA states, “Passive Interference affecting SEND and SEARCH:Metal parts, electronic devices with metal cases, foils and wire mesh, magnets ➔ Keep >20cm distance from metal parts and magnets.” Adding some more. To be clear this is NOT intended to disregard any professional recommendations, it is only to further discuss the original question. Here is how Rob C. replied to a question about interference and the TILT liner. You can find it in part 2 of his PIEPS Pro ISP review. Original question:”Rob have you done any testing to see if the foil on those Rab mythic series jackets interferes with this or other beacons?” Rob’s answer:”i DID test the Rab Ultra Mythic jackets with this thing! I wrapped both the Pro IPS in a Mythic and the Barryvox — didn’t seem to affect it at all. My hunch is the filament/treatment is so fine that it doesn’t impact the sending signal — somebody smarter could probably confirm/debunk that!”

    1. Travis

      Thanks, Jason. Possible for you to recreate the test? Side note, I miss Rob. 🙁 Thankful I got to ski with him last year.

  3. Alexander Rose-Innes

    I love these bags. I have the mythic 200 and 400 (both without the TILT lining) and they definitely outperform their rating. Super well-made. I’ve used the 200 down to -5 celsius with base layers and a thin mid layer on the top. The 400 can easily go to -10 if I wear my puffy layers. After trying quilts, I’ve found the best lightweight bivvy option for me is a thin sleeping bag and wearing insulating layers. Last year I tried a Feathered Friends 40 degree quilt in a bivvy bag and was super cold at -5 even with all my clothes on. Fully enclosed wins I think.

    The TILT lining, like the Mythic jacket, requires a leap of faith given the price.

  4. Peter H

    Hey Gavin, I’m interested to hear more about this. Do you have a WM Versalite and if so what types of trips and conditions do you use it? Anyone at THR use the WM ultralite? Also sounds like a very warm bag and slightly lighter/less pack volume. Would love to hear more generally about sleep systems being used for ski traverses. Could be a good deep dive topic.

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