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Mobile Mummy® 600 / 30 Degree

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The Mobile Mummy® moves when you do, so that you can sleep on your side, stomach or back without feeling constrained. You can wear it like a garment to sit up and use your hands, or stow the foot box for a walk around camp.


Shell Material:
30D Polyester Ripstop
Liner Material:
30D Polyester Taffetta
600 Fill Duck DriDown

Tech Specs

EN Comfort Limit:
41° F / 5° C
EN Lower Limit:
31° F / 0° C
Fits To:
Men's Regular: 6 ft / 182 cm
Men's Long: 6 ft 6 in. / 198 cm
Fill Weight:
Men's Regular: 12.71 oz. / 0.36 kg
Men's Long: 14.31 oz. / 0.41 kg
Trail Weight:
Men's Regular: 2 lbs 2 oz. / 0.96 kg
Men's Long: 2 lbs 4 oz. / 1.02 kg
Zipper Side:
Stuff Size:
Men's Regular: 7 x 14 in / 17.8 x 35.6 cm
Men's Long: 7 x 15 in / 17.8 x 40.6 cm
Season: 2 Season
Gender: Male
Insulation: DriDown
Temperature Rating: 30 Degree
    • Sierra Designs - Mobile Mummy

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    Product Reviews


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    1. Almost earned the trail name Pumpkin with this bag... worth it.

      I took this bag on my Appalachian Trail thru hike attempt (I made it to New York), and it worked quite well for me. I started in late April, so nighttime temps only fell into the 30s and I was warm and cozy, save for one night near Clingman's Dome in the Smokies when temps unexpectedly fell into the 20s due to a surprise front. With all my layers and a bag liner, this bag wasn't quite enough for low 20s (I slept in a shelter, and I'm skinny + tend to sleep cold anyway). That was my bad. I probably would have been just fine in my tent.

      Otherwise, this bag did just the trick. It compresses nicely into a small cylinder with a 10 liter compression sack, so it slides right down to the bottom of my 48 l pack, with room to spare to stuff clothes around it. My favorite feature is the arm holes, which I got lots of attention for because no one else I hiked with had a bag they could stay inside of while sitting up and doing things. I'm also a side sleeper with long legs and tend to stretch out in the night (especially after multiple 20 mile days when I'm sore all over), so having the zipper at my feet was a treat. That also helped if the night turned out to be warmer than expected and I didn't need to be totally cozied up inside it. In mid-August in NJ/NY, this bag was actually too warm to sleep in.

      One incident in which I had left the door in my tent's rainfly open just as a surprise downpour hit camp left part of the bag pretty soaked through. Since it was summer I didn't need to cozy up inside it, and it dried quickly when I hung it out in the sun the following day.

      And unless you like being called Pumpkin, don't walk around a hostel wearing this.
      on Mar 6th 2017

    2. 2 review - wow!!

      Just bought this bag late last year and have used it twice on extended day trip in the Sierras. I noticed that REI doesn't carry it anymore . . . WTF?

      Very light weight, compressible. It was plenty warm for me (I'm a hot sleeper though): temps in the low 20's at 11-12000 feet last November. Roomier than most mummy bags. I was able to figure 4 my legs inside. Love the arm slits: read my Kindle till I fell asleep, comfy and warm. Nice to be able to sit up, unzip and let dog out of tent without any hassle. OMG . . . . Getting up, walking outside, making coffee while still toasty warm in my bag . . . AWESOME!!! Such a simple, ingenious design feature . . . .how is it I've never seen it before?!?

      Honestly, I can't think of ANYTHING bad to say. This big stands out from the other 20 or so I've owned in my life. Great job Sierra Designs!!!
      on May 15th 2016

    3. Customer Review

      Used this two season sleeping bag on a two night kayaking trip of the Upper Missouri Wilderness Breaks Wilderness area. With nighttime temperatures ranging from the high 30's to the high 40's, I slept comfortably (in a tent) Truly appreciated having the means to free my arms without having to unzip the bag, as I took advantage of this feature on several occasions, and appreciated the mobility -- a feature that makes any other bag lesser by comparison. on Jul 2nd 2015

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