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 Nitro 800 20-degree 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.
Line review & specs
There are five Nitro models:
- Nitro 800 / 35-deg ($280, 1 lb 6 oz)
- Nitro 800 / 20-deg ($330, 1 lb 12 oz)
- Nitro 800 / 0-deg ($380, 2 lb 8 oz)
- Women’s Nitro 800 / 20-deg ($330, 1 lb 11 oz)
- Women’s Nitro 800 / 0-deg 9$380, 2 lb 7 oz)
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.
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.
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. I strive to offer field-tested information, insights, and advice, and I have a long-term incentive to be a trustworthy source. I do not publish sponsored content or native advertising, and I do not accept payments in exchange for reviews. I have no financial affiliations with or interests in any brands or products.
This website is supported by affiliate marketing, whereby in exchange for referral traffic I receive a small commission from select vendors like REI or Amazon, at no cost to the reader. This post contains affiliate links.
Also, I am a product and marketing consultant for Sierra Designs. But I had zero involvement in the development of this bag.