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Sierra Designs Nitro 800 Dridown Sleeping Bag: 20F Down

$449.95 - $469.95

A creamy pint of sleep.

You've made it this far on your Appalachian expedition, you're almost to Maine and you've picked up your pace. When really pushing yourself, you can make it twenty miles in a day, and when you lie down for the night the one thing you won't sacrifice is a good night's rest. The Sierra Designs Nitro UL 800 DriDown 20 Degree Down Sleeping Bag never felt like it was weighing you down, and it certainly warms you up so you can get some well-deserved snoozing all night.. This bag is filled with soft and creamy Dridown, and it will stay lofty and warm at cold temperatures, even if you encounter some rain on the trail. 

Designed with backpacking in mind, Sierra Designs created this lightweight bag using 15D nylon and 800 fill down, yet still with a generous cut for a little more room to get comfy after a long day on the trail. Plus they've decreased the baffle size to five inches so that the down doesn't have as much room to shift around on you in the middle of the night, ultimately creating a warmer experience. It's lightweight enough for your long trip, and still offers great amenities such as a foot vent for warm mornings and anti-snag zipper tracks. Look forward to sleeping the whole night through, while dreams of your next pint dance in your head.

  • Ultra lightweight backpacking bag for long trips and cold nights
  • Hydrophobic down stays lofty and warm even when the dew soaks in
  • Pop your knees up to open the foot vent when you're getting warm
  • Draft-Dodger hood cinches down when the nights get frosty
  • Half-length zipper reduces weight for long days on the trail
  • Mummy design with a generous cut for more comfortable nights
  • Item #SDS008X

15D nylon ripstop
800-fill Dridown
Max User Height
[regular] 6ft, [long] 6ft 6in
Shoulder Circumference
[regular] 62in, [long] 64in
Hip Circumference
[regular] 56in, [long] 58in
Foot Circumference
[regular] 40in, [long] 42in
Bag Length
[regular] 78in, [long] 84in
yes, self sealing foot
Fill Weight
[regular] 14.7oz, [long] 16.3oz
European Norm Comfort Rating
European Norm Lower Limit Rating
Storage Sack
Stuff Sack
Stuff Size
15 x 7.5in
Claimed Weight
[regular] 1lb 12oz, [long] 1lb 15oz
Recommended Use
Manufacturer Warranty

Tech Specs

What do you think about this product?


>Rating: 1

Sierra Designs Nitro 20 Regular

I've used it several times

On the surface, this 'had' to be great bag. I got it for The High Sierra Trail of 9 days in August. The coldest night was 30 degrees. Wearing a toboggan and mid-weight Capilene, I simply froze. I could see my fingernails through both layers of nylon and the down was NOT consistent with obvious empty tubes. BackCountry's awesome Customer Service made it right, or I would have lost 300.00 on a poor quality bag. I sold Sierra Designs 20-25 years ago and it was super gear. Times have changed and this goes down as one of worst gear failings in my 50 years of backpacking/mountianeering. And, its wide enough below the armpits to put another man, dog, or whatever.

>Rating: 3

Nice features, but not the bag for me

I returned this product before using it

I am in the market for a 3 season bag to replace my current Sierra Designs bag that is over 20 years old (still looks great btw, really says something about the quality). I was excited when I found the Nitro UL 20. 800 down fill on sale was a price that was hard to beat! Unfortunately, I was a little disappointed when the bag arrived for a handful of reasons. 1. Sizing: I ordered the regular length which is recommended for a person up to 6' tall. I am technically 6'1" so the regular length was a gamble, but I don't like sizing up to long unisex sizes (for 6'6") because I worry about being able to heat up the extra space in the bag. I am a slim 155lbs and run cold when I sleep. For reference, I fit into the Marmot Phase 30 bag (unisex regular length) and the Marmot Ouray (women long) and the Big Agnes Skeeter 25 (men's regular) comfortably. The Nitro UL runs very short. My feet and head were smashed in when zippered up. I had my Dad who is an even 6' tall and my friend who is 5'10" both try to bag. They each said that the bag seemed short. It also seemed to run quite narrow. The spoon-shaped design is supposed to be a little roomy, but this was actually much more narrow than my old SD bag and my Marmot Ouray. 2. Baffling: Even though the baffles are 5" wide I noticed huge gaps in the down when held up the light. The down fill shifts very easily in the baffles, which makes me wonder if the fill weight was shorted or perhaps the baffles should be smaller to keep the down from shifting so easily. It was easy to shake the bag out to reposition the down. But this might be problematic in the backcountry, leaving a person with cold spots and drafts. 3. Fabric and features: Although the 15D nylon felt very durable, it also felt quite cheap and papery. It did not give the impression that it would do a great job at repelling water (frost or condensation, etc). You can feel that it will do a good job standing up to abrasion from the occasional cowboy camp, but it did not seem particularly comfortable. The half zipper was very smooth and seemed durable. There was zero snagging when zipping the bag up or down. Lastly, the venting foot box is a neat feature that compensates for the half zipper nicely, but there is still room for improvement. With the narrow shape and feel of the bag, it was a bit difficult to bend my leg enough to get my feet out of the vent. Once my feet were out they didn't have much wiggle room. Adding just an inch or two to the width of the bag would make a huge improvement in overall comfort and ease of use. Overall, I can see the Sierra Designs team really put a lot of thought into the design of this bag. It targets the budget conscious through hiker as well as the gram counting alpinist. The features nicely intersect between quality, cost efficiency, weight, and packability. I was impressed by the bags ability to squeeze down to half the volume of the included stuff sack. This is a good budget alternative to a Hyperlite, Feathered Friends, or Western Mountaineering bag and will likely last a person many years with proper care. But overall, I made the decision to go for a Marmot bag due to fit and my personal preferences.


Overview the new 2018 SD Nitro 800

ALTER YOUR TASTES, TAP INTO LIGHTWEIGHT, MUMMY-STYLE COMFORT. The Sierra Designs Nitro brings back the classic mummy shape at an impressively low weight, yet comfortable price.