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  • Insulated with lightweight and compressible Q.Shield™ 650-fill-power down to keep you warm
  • Q.Shield advance water repellency technology protects individual down fibers from moisture so they retain loft and insulation properties; Q.Shield won't wear off
  • ThermoTrap Baffle construction locks the down into small chambers for less down migration, an even loft height and consistent wamth
  • With a lower-limit European Norm (EN) rating of 12°F, the Ratio 15 is a versatile bag for lightweight adventures into the mountains
  • Comfort mummy cut efficiently maximizes warmth and minimizes weight without constriction
  • Down-filled face gasket comfortably blocks drafts at the hood opening
  • Insulated draft tube with anti-snag panel prevents cold spots along the zipper
  • Full-length, two-way zipper with locking sliders stays in place when the bag is partially unzipped for ventilation
  • Single-handed drawcords easily adjust hood closure
  • Mountain Hardwear Ratio 15 sleeping bag comes with a mesh storage sack and a stuff sack


View all Mountain Hardwear Men's Sleeping Bags

REI membership


Best Use Backpacking
EN Lower Limit 12 degrees Fahrenheit
EN Comfort 24 degrees Fahrenheit
Temperature Rating (F) 12 degrees Fahrenheit
Temperature Rating (C) -11 degrees Celsius
Long Left
2 lbs. 10 oz. ounces
Regular Left
2 lbs. 8 oz. ounces
Shell Nylon
Zipper Location Left
Insulation Type Down
Water-Resistant Down Yes
Fill 650-fill down
Fill Weight
Long Left
1 lb. 7 oz. ounces
Regular Left
1 lb. 5 oz. ounces
Lining Nylon
Sleeping Bag Shape Mummy
Fits Up To (in.)
Long Left
78 inches
Regular Left
72 inches
Shoulder Girth (in.)
Long Left
64 inches
Regular Left
62 inches
Hip Girth (in.)
Long Left
60 inches
Regular Left
58 inches
Stuff Sack Size 8 x 15 inches
Stuff Sack Volume 12 liters
Compressed Volume
Long Left
8.4 liters
Regular Left
7.7 liters
Gender Unisex
Rated 5 out of 5 by from Awesome Bag! In preparation for a campaing and kayaking trip to Vancouver, I bought my wife a Heratio 15 and another brand named after a way up Everest for myself. She loved her Heratio and was comfy in just her underwear. I had to put on longjohns and socks to get warm, and one of the cross baffles basically did not have any down in it! So, when we got back, I disposed of my NF bag and got myself a Ratio. Aaaaahhh, pure bliss! Super warm and comfortable; just plain perfect. Couldnt possibly recommend it more highly.
Date published: 2015-10-28
Rated 2 out of 5 by from Light but not warm enough for me. While I love the size and weight, I have to admit it is not as warm as I hoped. It is rated for 15 degrees F. I took it camping in mid-October here. There was frost when we woke up. I got in my car to warm-up, where the car themometer said it was 30F. But I was very cold all night, too cold to relax at all, even though I was on top of a Thermarest, and was wearing a hat, socks, polypro pants, and 2 layers on my core. I am skeptical that this was tested at the rated temperature. I am 57, and I have camped a LOT, so I have to admit that my synthetic rectangular LumberJack is heavy but warm. I recommend you adjust your temperature expectations by at least 20 degrees.
Date published: 2017-04-05
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Can two of these sleeping bags be zipped together? Is there a right and left hand zipper option?

Asked by: AngerNoodle
The men's Ratio is a left hand zip bag. We do not carry a men's right hand zip version, but this sleeping bag can be zipped to a Mountain Hardwear women's right hand zip bag.
Answered by: REIservice
Date published: 2017-03-27

Does the bag come with a compression bag? If not what size compression bag would it take? Any idea how small it would be compressed down too?

Asked by: dc9mm
The Ratio 15 comes with a stuff sack and not a compression sack. A 16 liter compression sack would be a good size for the Ratio. With a compression sack, you can get the bags stuffed volume from 12 liters to 8.4 liters.
Answered by: REIservice
Date published: 2017-02-10

How long can this bag be compressed for?

Asked by: 90am
There is no time limit for how long a bag can stay compressed. However, for optimal lifespan, we recommend not compressing a bag for longer than necessary. Sleeping bags should be stored loosely in a storage sack to prolong the lifespan of the fill materials.
Answered by: REIservice
Date published: 2017-04-14

If you use a compression sack in place of a stuff sack, for backpacking during the day, and it is opened each night, is the loft is any way compromised? 

Asked by: piano1
​The down will maintain its loft. Shake the bag out when you are ready to use it. Do not store it in a compression stuff sack or a stuff sack for long periods. Lay flat or store in a large storage bag when at home.
Answered by: REIservice
Date published: 2017-06-08

It's weirdly heteronormative to have only left zippered bags for men and right zippered bags for women. I can't zip my bag to my female partners? You need to update your manufacturing and purchase policies to reflect the diversity of your customers.

Asked by: bearS
I'm not sure what your question is here.  I would recommend purchasing a sleeping bag manufactured with a left hand zipper and one with a right hand zipper and adjust your weirdly heteronormative policies to reflect your outdoor sleeping needs.  You can also try googling "custom sleeping bag", you can design a bag that meets your specific sleeping needs VS: everyone else adjusting to meet yours.           
Answered by: Redrocket
Date published: 2017-06-23

Are you going to have Regular Right Zip available, soon? For both Ratio 15 and Heratio 15, I think you should have both right and left zip so that man's and woman's can be zipped together. My niece has Left-Zip Heratio 15 and I am looking for a Right-Zip.

Asked by: Tagish
​We carry sleeping bags that have a left hand zippers for men, right hand for women. So you can zip a men's to a women's sleeping bag. We will not be adding the opposite side zippers to our inventory.
Answered by: REIservice
Date published: 2017-06-01

Is this bag a good option for side-sleepers?

Asked by: TonyRob
Yes, the Ratio 15 Sleeping Bag will be a decent choice for side sleepers.
Answered by: REIservice
Date published: 2017-06-01

Are the lengths correct for regular and long sizes? Per Mountain Hardwear website and others, the regular size is 78 inches and the long is 84 inches.

Asked by: Mag6
The lengths listed in the specs on are referring to the height of the user. For example, the regular length bag fit a person up to 72 inches (6ft) tall. The long version fit a person up to 78 inches (6'6") tall.
Answered by: REIservice
Date published: 2017-04-17
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