Sierra Designs Mobile Mummy 800 Sleeping Bag: 30 Degree Down

A mummy that moves.

The Sierra Designs Mummy 800 Sleeping Bag has some unique features that'll knock your socks off. Or rather, that'll let you keep your socks and shoes on. Like many down mummy bags, the Sierra Designs Mobile Mummy 800 Sleeping Bag is light enough for backpacking trips and warm enough for temperatures as low as 30°F. Stuffed with 800-fill duck down insulation, this lightweight bag has an excellent warmth-to-weight ratio, and it stuffs into a small corner of your pack so you can easily bring it along. Unlike many down bags, however, Sierra Designs added its proprietary DriDown treatment to the down for water-resistant protection if you're camping in wet environments. And unlike most mummy bags, the Mobile's unique design allows you to sleep on your side and stomach as well as your back. Sierra Designs also reinforced the hood and draft collar with insulation to prevent cold-air drafts while you sleep.

Ok—now for the socks and shoes part. Unlike almost all sleeping bags, this bag can travel with you out of the tent and around the camp so you can be warm when you're star-gazing at night and when you're sipping your breakfast beverage and watching the sunrise in the morning. To gain mobility, just push your arms through the zipperless armports and slide your feet through the center, two-way zipper. Then attach the footbox to the bag just above your knees so it doesn't drag on the ground while you walk around. When you're up and about in this bag, its design makes sure the bag rests on your shoulders like a jacket instead of resting uncomfortably on the hood.

  • 30°F temperature rating
  • 800-fill duck DriDown insulation
  • Unique mummy design
  • Stowable footbox and zipperless armports
  • Nylon ripstop shell
  • Nylon taffeta liner
  • Reinforced, insulated hood and draft collar
  • Center, two-way zipper
  • Reviews
  • Q & A

Bed, Garment, or Quilt

DriDown

Award Winning Mobile Mummy

Mobile Mummy wins Outside's 2014 Gear of the Year Award

Award Winning Mobile Mummy

I am just a hair over 6'6" would this work?...

I am just a hair over 6'6" would this work? or is it like most bags that won't even fit 6'6" even though they claim too?

Honestly, 6'6" would most definitely be the max user on this. Since its not only the overall length of the bag but also the shoulders that are restricting if you are much taller than that max user height then the opening in the foot box becomes mandatory for any use.

Best Answer

If this bag is too short for you, you might try contacting Feathered Friends in Seattle who has been making this type bag for years (Rock Wren / Winter Wren). They are hand made in Seattle and you used to be able to order custom length/fill - not sure if that's still an option but worth a shot.



Another option is the Exped Dreamwalker which claims to have a 70" shoulder girth.

If this bag is too short for you, you might try contacting Feathered Friends in Seattle who has been making this type bag for years (Rock Wren / Winter Wren). They are hand made in Seattle and you used to be able to order custom length/fill - not sure if that's still an option but worth a shot. 

Another option is the Exped Dreamwalker which claims to have a 70" shoulder girth.

Great Bag

  • Familiarity: I've used it several times

Used this for a couple camping trips already this year and I love this bag. I tend to roll around quite a bit in my sleep, which was a pain in my old mummy bag. But this really works as advertised. It does roll with you as you sleep. Very comfortable. Highly recommend.

Mobile Mummy

Simply Awesome!

I love my Sierra Designs Mobile Mummy Sleeping Bag. The Sierra Designs Mobile Mummy Sleeping Bag sets it self apart from other bags in the ingenous design with a snug head, ability to get your arms out without unzippinng the bag and the comfort of the materials is unmatched. My Sierra Designs Mobile Mummy Sleeping Bag has been down to 6 degrees farenheit with no super cold feeling. The Sierra Designs Mobile Mummy Sleeping Bag is rated to 15 degrees farenheit but it certainly can go below that, which is odd for sleeping bags as normally they are over rated. This Sierra Designs Mobile Mummy Sleeping Bag is underrated in my testing. They have a 2 season and a 3 season, mine is the 3 season. I love the Duck Dri Down used, it keeps you warm even when wet, which is the major flaw with normal untreated down and it is super warm! This bag heats up amazingly fast. Berz Rating: 98/100



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Great video! I run really warm and get pretty hot in bags so the ability to stick my feet and arms out is awesome. I don't ever do winter/snow camping doing most of it during spring/summer/early fall. Would you say that the 2-season might work ok for going down to maybe just below freezing? Also, did you compress it and check out how small it can go? I'm am an ultra lighter and am wondering what the compression does? Last question...how did you find the proportions for hips and chest. I'm a woman but can't stand women's cut bags. I like a bit more room for moving around in. Thanks soooo much!!

Awesome features, but...

  • Familiarity: I've used it several times

Pros and cons for this bag should be mentioned.



I am relatively happy with it. I am 5'11'' 250lbs. most of my mass is in my shoulders and chest. I have had a VERY hard time finding a bag that wasn't too tight in the shoulders. I eventually bought a quilt from Enlightened Equipment, but that doesn't work well in a hammock without a pad (which I often use). After trying a couple western mountaineering, stoic, lafuma and Montbell bags, I saw this and noticed that Sierra did something nobody else has done with a bag: in the "long" bag, they offer 68" of shoulder circumference. THANK YOU!!! EVERY other company only offers 64" shoulders in their "wide" bags.



Although, I don't think they did it for the reason I wanted it. I think they had to add the extra 4 inches so you can bend your arm enough to get your arms through the armports. I am super grateful. In lightweight gear, there is NO big man love. And I LOVE camping.



The armports and ability to wear this as a coat is just a bonus. it does work well.



I don't know why they use duck down. 800 duck down is a pretty crazy claim. I don't know if I believe that. The loft is less than goose down, and this isn't nearly as warm as my Stoic 30 degree, which I always thought didn't have much down, but has MUCH more than this.



If another company like Marmot or Western Mountaineering made a design like this, It would be WAY better. the baffles on this and the visible cold spots are a concern. They really didn't put much down in this AT ALL. It will be fine for me in the summer... but its kind of sad they skipped THE most important step in a good bag (the down).



It packs pretty small. smaller than my alpinlite, slightly larger than my stoic 30... but this bag really is cool. the freedom to pull your arms out really changes things.

The Exped Dreamwalker (Long) claims a 70" shoulder girth. I have their lightweight synthetic version and love it.