Mobile Mummy 800 / 15 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:
20D Nylon Ripstop
Liner Material:
20D Nylon Taffetta
800 Fill Duck DriDown

Tech Specs

EN Comfort Limit:
27oF / -3oC
EN Lower Limit:
16oF / -9oC
Fits To:
Men's Regular: 6 ft / 182 cm
Men's Long: 6 ft 6 in. / 198 cm
Fill Weight:
Men's Regular: 19.21 oz. / 0.54 kg
Men's Long: 21.51 oz. / 0.61 kg
Trail Weight:
Men's Regular: 2 lbs 4 oz. / 1.02 kg
Men's Long: 2 lbs 8 oz. / 1.14 kg
Men's Regular: 80 in. / 203 cm
Men's Long: 84 in. / 213 cm
Men's Regular: 64 in. / 163 cm
Men's Long: 68 in. / 173 cm
Men's Regular: 58 in. / 147 cm
Men's Long: 60 in. / 152 cm
Men's Regular: 40 in. / 102 cm
Men's Long: 42 in. / 107 cm
Zipper Side:
Stuff Sack Length:
Men's Regular: 15 in. / 38 cm
Men's Long: 15 in. / 38 cm
Stuff Sack Width:
Men's Regular: 8 in. / 20 cm
Men's Long: 8 in. / 20 cm
This item may be patented
Backcountry Edge:
Season: 3 Season
Gender: Male
Insulation: DriDown
Temperature Rating: 15 Degree
    • Sierra Designs - Mobile Mummy
    • Sierra Designs - The Differences in Sierra Designs Sleeping Bags

    Product Reviews


    Write A Review

    1. Very innovative, it works, pretty much as advertised

      First, this is the best bag out there considering the innovation. The center zip, arm flaps and coat-like innovations are brilliant and work. My two negatives amidst tons of positives are the bag is not quite warm in the upper twenties to low thirties without clothing help and to use it properly while you "roll" in it you need your arms outside through the arm ports each time you roll. They're making a sleeping bag into a form of clothing (brilliant). I'd like to see a coat made into a sleeping bag. These are the guys to do it. I recommend this bag highly. My comments are because it has room for growth and not as a downgrade to the item. It is better than any other bag I've looked at or tried which is also very limited. This bag works on Oct 11th 2016

    2. Versatile

      It's hard not to love this sleeping bag. I want to take it with me everywhere! It just looks so damn sexy. It performs great from summer to winters below 20°f. The design is functional and simple. The arm hole design works as well as it's touted, no drafts of air at all! If you're like me and like to roll around before eventually settling into sleeping on my back, there is enough room to wiggle around inside. It'll pack down to about 8"x6" in compression sack.
      During the summer, having the arm holes and the footbox make my life more comfortable when I unzip it and use it as a quilt. It's kept me warm through a few winters below 20°f.

      Nature doesn't usually call me in the middle of the night, but I do enjoy being able to stay in the sleeping bag a little longer in the morning as I crawl out of my shelter and make breakfast.

      It's a little pricey, but you won't regret this investment.
      on May 27th 2016

    3. The New Standard

      Moving the zipper to the middle and having arm ports seems like small details but make a huge difference in the user experience. First trip with the bag was a humid night in the low 50s in a Nightwatch 2 and the minor condensation didn't impact the down at all. Venting was great and this bag should serve me well for three seasons as designed. 5 out of 5. Would camp again. on May 26th 2016

    4. Customer Review

      This is a wonderful product. I love it's simplicity and innovation with removing the draw strings around the face and having the arm holes that close to prevent a draft. It isn't super tight around the legs which makes it comfortable for someone who likes to spread them. Perfect for hammock campers because it makes getting in and out of your hammock simple. The price is high but it's worth every penny due to the quality of the product. A warning to all, people will question your sobriety if walking around your home with it on. on Sep 7th 2015

    5. Customer Review

      Such a great idea, so plush and comfortable while sleeping..especially side sleeping which is def me. As you can imagine getting up in the middle of the night or early am is great to not have to get out of your bag to do the basics. Love the front zip as opposed to side zip. Hood is cushy and conforming which takes a little bit to get used to. Haven't slept in real cold temps yet so looking forward to doing some higher altitude tests soon. on Mar 20th 2014

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