Sierra Designs Zissou 23 Sleeping Bag

This product is no longer available, but don't go just yet.

This 3-season sleeping bag features Sierra Designs water-resistant DriDown&#8482. It resists water and dries fast for backpacking in chilly, wet weather.

700-fill duck down
2 lbs. 3 oz.: Long - Left Zip
2 lbs.: Regular - Left Zip
Compressed Volume
8.8 liters: Long - Left Zip
8.6 liters: Regular - Left Zip
Temperature Rating (F)
23 degrees Fahrenheit


  • Regular down takes on water and is very difficult to dry; DriDown proprietary process treats each individual duck down plume with a hydrophobic finish
  • With the duck down now resistant to water, the insulation maintains its loft and stays dry 7 times longer than untreated down
  • It also performs better in high humidity than regular down and, in case it accidentally gets wet, it will dry out faster, too
  • Lightweight yet durable 30-denier micro-ripstop polyester shell and comfortable, moisture-wicking polyester lining warm up fast
  • Baffle construction keeps down from migrating, eliminating cold spots
  • Full-length 2-way, double sliding zipper allows easy venting; locking slider is backed by wide, antisnag binding tape
  • Snag-free zipper tracks prevent the dreaded stuck zipper by creating a barrier between the lining and the zipper track
  • Fully insulated draft tube backing the zipper keeps body heat in and cold air out
  • Ergonomic, nonrestrictive hood cradles your head in warmth; hood features differentiated drawcords that make fit adjustments easy, even in the dark
  • Roomy, ergonomically shaped footbox enhances comfort and warmth of feet
  • Sierra Designs Zissou 23°F comes with stuff sack and storage bag
  • European Norm (EN) is an independent third-party temperature rating, allowing accurate comparisons across brands with other EN-rated bags


Technical specs

Best Use
EN Lower Limit
23 degrees Fahrenheit
EN Comfort
34 degrees Fahrenheit
Temperature Rating (F)
23 degrees Fahrenheit
Temperature Rating (C)
-5 degrees Celsius
Long - Left Zip: 2 lbs. 3 oz.
Regular - Left Zip: 2 lbs.
Ripstop polyester
Zipper Location
Insulation Type
Water-Resistant Down
700-fill duck down
Fill Weight
Long - Left Zip: 16.5 ounces
Regular - Left Zip: 15.5 ounces
Sleeping Bag Shape
Fits Up To (in.)
Long - Left Zip: 78 inches
Regular - Left Zip: 72 inches
Shoulder Girth (in.)
Long - Left Zip: 64 inches
Regular - Left Zip: 62 inches
Hip Girth (in.)
Long - Left Zip: 60 inches
Regular - Left Zip: 58 inches
Stuff Sack Size
7 x 16 inches
Stuff Sack Volume
10 liters
Compressed Volume
Long - Left Zip: 8.8 liters
Regular - Left Zip: 8.6 liters



1–8 of 37 Reviews  
Active Filters
  1. 5 out of 5 stars.

    Pretty much obsessed

    More like 4.75 stars out of 5, but I was forced to round up.

    Bought it a week ago and have slept in it every night (once backpacking, once car camping, 5 nights on my bed). The loft-factor is cloud-like and is addictingly comfortable.

    Size-weight-warmth-packability ratios are superb.

    I'm 6'0, 165lbs and fit great in the regular size. If you're 6'1 and of a more lean build, you'll probably do just fine in the regular too (but still make sure you try in on first!). 6'2 and you're going to be pushing it, probably best to go large at that point.

    Minor down side (why I took 0.25 star off): It's advertised as a full zipper, but it's more like a 4/5 zipper.

    2 people found this review helpful. 0 people did not find this review helpful.
  2. 4 out of 5 stars.

    Lightweight & Warm

    Bought this bag for an upcoming hiking trip, and to use during the rest of my deployment in Afghanistan. I always freeze, but not in this bag! The included stuff sack packs the bag down to a size slightly larger than a 2 liter bottle. I've taken it directly from the stuff sack and immediately crawled in, and it still kept me warm without needing time to 're-fluff'. It meets my needs-small, lightweight, warm. I haven't had it in a wet environment, so can't comment on the dridown.

    9 people found this review helpful. 0 people did not find this review helpful.
  3. 5 out of 5 stars.

    Best bag I've ever owned

    I'm 6'5" and 235lbs with size 15 feet, and I never feel cramped or confined in this bag. I don't typically camp in wet conditions, so for me the DriDown is more of a "safety" feature in case I get caught in an isolated thunderstorm and my bag gets wet. The zipper doesn't snag on me, and the bag packs down incredibly small. I'm going to buy the women's version for my wife.

    12 people found this review helpful. 0 people did not find this review helpful.
  4. 4 out of 5 stars.

    Perfect bag for the trip

    I used this on a backpacking trip in the Red River Gorge. It was a wet drip and my bag performed like new the whole time. It is light and compressed very well. It even felt a little roomier than most bags that I've used. The temp got down to around 33 F and I was hot with pants and a t-shirt. I'm anxious to test it out in the "real" cold.

    2 people found this review helpful. 0 people did not find this review helpful.
  5. 5 out of 5 stars.

    Good fit

    I bought this bag to shave a few ounces and a little room off my pack, and still stay warm on those chilly mountain mornings. This bag did all of it. I have not tested the dri down due to the fact that i use a dry compression sack to pack it in, and my tent does not leak, so I will have to take their word that it's good stuff. Fits good with me and my pack.

    6 people found this review helpful. 0 people did not find this review helpful.
  6. 4 out of 5 stars.

    Great bag with a few shortfalls.

    Many great features. Nice weight and condensed size. Took this bag backpacking for 3 days. My only two problems with the bag are: 1) Bag israted at 20 degrees yet I was cold my first night in the bag waking up several times in 35 degree weather 2)Mummy style bag is to restrictive in the legs area . I could not sleep with one foot under my other knee as I usually do. Just a minor comfort thing.

    5 people found this review helpful. 0 people did not find this review helpful.
  7. 4 out of 5 stars.

    Great to join the 21st Century

    So.... I last bought a sleeping bag in 1991 - a 20 degree mummy bag with synthetic fill. I finally decided that Old Nelly was just too heavy and bulky for the backpacking trips that I was going on with my 5 year old (suddenly, the old bag seemed just too heavy when I was ALSO carrying my daughter's). I very much like this bag. It is light and packs small and is very warm. I am 6 foot 3 and 205 pounds and don't feel too cramped (it's a mummy bag, so it's all relative - you're never going to sleep spread eagle in it). I am only giving 4 stars because I've taken it on only two trips and have only made limited use of it. I would definitely recommend this bag.

    0 people found this review helpful. 2 people did not find this review helpful.
  8. 4 out of 5 stars.

    The Great Sleeping Bag Compromise

    Let me start by admitting that I'm a sleeping bag snob. After buying a Marmot Atom, I've converted completely to down and can't go back to synthetic. I try to buy the nicest down bag I can afford. I needed a 20*F bag for car camping but really wanted one I could backpack with as well. I was going to buy a synthetic for the weather resistance but I just couldn't do it. I had given up my search when REI put this bag on sale for 25% off.

    I am very impressed with this bag. It wouldn't qualify as an UL bag, but at a fraction the price with some supposed water resistance it is a great price and weight. It is very compressible, probably compresses to about 2L. The shell is very comfortable; it's slick but not noisy, warm but breathable. The bag is 95% as nice as my Marmot 850 bags at a fraction the cost.

    I must warn, however, it is definitely a 20*F bag. By that I mean, 23*F is the lower limit rating. I have used the bag several times above freezing and it's been comfortably warm in a base layer. Last night, however, the temperature was in the upper 20s with occasional light breezes (I avoid tents, I was on a tarp with just the bag). My core was very warm but my legs and feet were very cold. You can definitely survive a night in the 20s but next time I'm bringing some thermals and warmer socks!

    It's been holding up great after a dozen nights or so. I have not complaints about the bag. If I had to pick a nit, it would be the zipper which is sometimes stubborn (like every bag) but it was advertised to be snag isn't really.

    If you need the ultimate compromise of a bag -- down luxury with the weather resistance of plastic -- consider the Zissou.

    11 people found this review helpful. 0 people did not find this review helpful.

Questions & Answers

Questions & Answers

    1. The Zissou 23 comes with a Sierra Designs stuff sack and storage bag.

      0 people found this answer helpful. 0 people did not find this answer helpful.
Back to top