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Review: Sierra Designs Nitro 800 mummy || Great price, ordinary design

Cowboy camping in Tablelands at 11,000 feet in September, using the new 20-degree Nitro 800 mummy bag from Sierra Designs

The Sierra Designs spring 2018 line-up has two themes: (1) back to basics, and (2) better pricing. Innovation is not entirely lacking, evidenced by the “zipperless mummy” Cloud series (my review) and the High Side Tent (my review), but the “better and different” mantra was no longer a requirement of new products.

Review: Sierra Designs Nitro 800 mummy bag

These two themes are both embodied in the new Nitro 800 bags: the designs are solid and well executed, but relatively ordinary; and the prices are very competitive.

I slept in the 20-degree Nitro 800 for two consecutive weeks last month while guiding trips in Sequoia-Kings Canyon National Park. Nighttime low temperatures were normally in the high-20’s, except for a few nights after a cold front moved through — a nearby monitoring station recorded 13 degrees, although our deliberately selected campsite was probably five degrees warmer. Some nights I slept inside a full-sided tent, but most others I slept my favorite way: cowboy camping under the stars.

In sub-freezing conditions, I abandon my summer quilt in favor of a mummy bag — quilts are too drafty and they leave my head too exposed. Yes, I could carry an insulated balaclava, but a hooded mummy bag is simpler, lighter, more thermally efficient, and less expensive all things being equal.

Based on these two weeks of use, I found the Nitro 800 to be:

  • Lightweight and compressible, for its warmth;
  • Comfortably sized, with room for me (6′ and 160 lbs) while wearing hiking clothes, mid-layer fleece top, puffy jacket, puffy pants, and booties;
  • Thoughtfully designed, e.g. functional hood adjustment, sufficiently long side-zipper, effective anti-snag zipper guard, and simple draft collar.

I will not offer a personal testament as to the Nitro’s temperature rating. The bags were EN tested, and these results are much more reliable when comparing the relative warmth of sleeping bags.

In terms of performance, the Nitro bags are unexceptional: the mummy market is crowded with high-quality bags, and most brands use the exact same materials, construction techniques, and Asian factories. Some brands differentiate their products with premium materials and Made in USA manufacturing (e.g. Western Mountaineering), but for the others it’s a war of weight, warmth, and price point. In this regard, the Nitro 800 generally outperforms the competition.

Another cowboy camp in sub-alpine at around 10,000 feet

Line review & specs

There are five Nitro models:

The men’s/unisex models are available in sizes Regular (up to 6′) and Long (up to 6’6″; +2-4 oz vs Regular lengths).

The temperature ratings on the women’s bags are conservative. These models are shorter and narrower (i.e. less surface area), yet contain the same amount of 800-fill down insulation as the men’s bags. As a cost-savings measure, the women’s bags were not EN-tested separately, so the published EN ratings are the same as the men’s models.

The Nitro 800 bags have a 40-inch side zipper. It was sufficient for comfortably getting into and out of the bag, while saving weight over a full-length option (at the expense of versatility).

Materials and construction are consistent across the line:

  • 800 fill-power PFC-free water-resistant DriDown
  • 15-denier shell and liner fabrics
  • 5-inch baffles, which reduces down shifting better than standard 6-inch
  • 40-inch zipper with anti-snag track
  • Cord tension system on the hood
  • Shingled foot vent for lower extremity venting
  • Contoured draft collar on 20- and 0-deg models

To learn more about the Nitro 800 series, watch this video with the Product Manager, Casey Sumnicht.

The 5-inch-wide draft dodger collar runs seam-to-seam and stays in place using the tension of the bag, not a cord tensioner. It’s a feature on the 0- and 20-degree models, not the 35 deg.

Product comps

How does the Nitro 800 compare to existing products? In the chart below I’ve tallied specs of popular mummy bags that are similar to the 35-degree model. Overall, the Nitro 800 35-degree hits a good combination of weight, warmth, and price. There are lighter 35-degree bags and there are less expensive 35-degree bags, but as far as I know there are currently no 35-degree bags that are both lighter and less expensive than the Nitro 800.


Questions or comments about the Nitro 800 series? Post it below.


Disclosure. This website is supported mostly through affiliate marketing, whereby for referral traffic I receive a small commission from select vendors, at no cost to the reader. This post contains affiliate links. Thanks for your support.

Also, I am a product and marketing consultant for Sierra Designs. But I had zero involvement in the development of this bag.

12 Responses to Review: Sierra Designs Nitro 800 mummy || Great price, ordinary design

  1. John October 18, 2017 at 11:06 am #

    Slightly confusing that you used 20 degree bag, but comparisons are for the lighter 30 degree bag.

    • Andrew Skurka October 18, 2017 at 11:20 am #

      It’s time-consuming to pull those spec charts together, so I stopped after one. And I started with the 35 deg model.

      If a comp chart for the 20-deg model were compiled, you wouldn’t see much movement. The changes in price and weight will be incremental for different versions of the same bag design. For example, the 20-deg Nitro (EN ratings of 28/17) is $330 and 1 lb 12 oz. The Igneo 17 Long (same EN ratings) is still slightly less expensive and slightly heavier, $300 and 2 lb 2 oz. And the Marmot Helium (the warmer version of the featured Hydrogen, with EN temps of 25 and 14) remains heavier and more expensive than the Nitro: $400 and 2 lb 1 oz.

  2. Dave N October 18, 2017 at 3:17 pm #

    Thanks for posting this review. I’ve been toying with the idea of a new 20F bag and thinking about going with a down bag this time. I will definitely give this bag a closer look. Trying to decipher the rest of your sleep system from the photos: Neo-air X-lite, Boston Marathon emergency blanket as a ground cloth, backpack and something thin, flat and white under the head/torso area?

    • Matthew October 18, 2017 at 5:48 pm #

      I’m going with compactor bag under the head/torso. I’d be curious to know why you do that, Andrew. I always leave the compactor bag in my pack.

      • Andrew Skurka October 18, 2017 at 6:49 pm #

        By putting the trash compactor bag under my upper body, it adds another layer of puncture resistance for the air pad. Upper body: mylar sheet + compactor bag. Lower body: mylar + backpack. Easy to do, and given the consequences of a leaking pad I think it’s worth it.

        • Matthew October 18, 2017 at 7:54 pm #

          That makes sense. Thanks for sharing your thinking.

    • Andrew Skurka October 18, 2017 at 6:46 pm #

      Premium down bags are almost family heirlooms. Not quite on the same level as cast iron skillets and wood planers, but close.

      Rest of sleep system:
      * Mylar blanket from Boston, mostly to keep gear out of dirt, some warmth
      * Backpack under the feet, for insulation and to reduce pressure on my back, and a 2.5-mm trash compactor bag under my upper body, as another layer of puncture resistance
      * NeoAir
      * Sleeping bag

  3. Rob October 19, 2017 at 8:12 am #

    Andrew, at the beginning of the videos, it shows Sierra Designs branded trekking poles. New product?

    What’s your opinion on Western Mountaineering bags?

    • Andrew Skurka October 19, 2017 at 9:10 am #

      Yes, new product, but I don’t know the status, e.g. release date, specs.

      Western Mountaineering is the gold standard for down sleeping bags and down apparel. If you can afford it, you can not go wrong with WM. They have been doing it a long time and understand bag/apparel design better than anyone. If I were looking for a premium+ bag I would go with WM before another brand that is competitive with them or perhaps even better than them on a spec basis.

      Feathered Friends falls into the same category as WM. For whatever reason they don’t pop up as often, though.

      • Rob October 20, 2017 at 8:47 am #

        Thanks Andrew. I’ve got a question about sleeping in mummy bags. Are you supposed to roll inside your bag, or is the bag supposed to roll with you? I’m a thrasher at night, seemingly constantly moving. I currently have a first generation Backcountry Bed, which I like, but would to drop a little more weight and eliminate some of the draftiness. So I’m looking at mummy bags, but don’t want to end up in a twisted knot by morning.

  4. Tree November 1, 2017 at 7:51 am #

    I just spent 3 nights in the Pecos Wilderness in the Nitro 20. 2 nights were above 11,500′ with temps down to 15°F. I slept under a Black Diamond Megamid.

    The last night was cowboy camping on a Mesa at about 10k elevation. Low 25°.

    I am a cold sleeper and I was never cold in the Nitro. I am quite impressed with this simple, functional bag.

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