Cool Brewing Fermentation Cooler Bag

Cool Brewing Fermentation Cooler Bag

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Control your fermentation temperatures with Cool Brewing's simple, yet innovative, insulated fermentation bag. This is the 2nd generation Cool Brew bag, which has made cold fermentations even easier!  Fermenting your homebrew at the right temperature is one of the critical factors in making good beer. Let the temperature get too warm, and your beer will taste 'rough' as the soft malt and vibrant hop flavors dissapear!  Typically an advanced homebrewer would want to get a spare refrigerator or even a MoreBeer! Cooled Conical to control fermentation temperatures, both those options either take up a lot of space or can cost a fair amount of money.  The Cool Brewing Bag allows the apartment brewer, those who have space constraints, or the brewer on a budget a great option to control fermentation temperature and make great beer.

Cool Brewing's Fermentation Cooler is designed specifically to accommodate standard 6.5, 6 or 5 gallon fermenter. You freeze a 2 liter soda bottle with water, or similar, and place in the fermentation bag with your fermenting carboy.  Also works great with the Ss BrewTech Brew Buckets!

The typical desired ale fermentation range is on average around 62-72° F.  For a typical 5 gallon batch (1) frozen 2-liter bottle should lower wort temperature around 5 degrees, while using (2) 2-liter bottles will lower wort temperature around 11 degrees for 24-36 hours. Of course your exact results might vary but you can adjust the amount of ice you use as you go. The manufacturer has found they can cool the wort temperature up to around a 30-35° drop from ambient room temperature.  On the flipside, add a Fermwrap and temperature controller to the setup, and you've got a heated fermentation temperature accurate to within 1° F!

The Cool Brewing Fermentation Cooler is sealed, insulated and 100% waterproof so it will efficiently and neatly keep your temperatures in check.  When you’re done, the Cool Brewing Fermentation Cooler easily folds up for storage until the next brew day!

 Cool Brew Features:

  • Up to twice as efficient and cleaner then homemade swamp coolers
  • Much less expensive than custom kegorator or keezer set up's that cost $100's of dollars.
  • Cool Brewing Cooler will work with multiple sized fermenters.
  • 100% waterproof so will not leave condensation.
  • It folds up for easy storage when not in use or travel.
  • Will work great in condos and warm climates where you need a swamp cooler even for Ale’s!
  • Contains the mess of any fermentation blowouts
  • Inner dimensions: 20.5"D x 25.5"H
Item # FE530
Shipping Eligible for Free Shipping Program
Availability California - In Stock
Pennsylvania - In Stock
Weight 5 LBS
Community Q&A

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Browse 2 questions Browse 2 questions and 10 answers
Why did you choose this?
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Gift for someone who brews beer
Melissa M on Dec 16, 2022
Past experience
Pierce R on Mar 23, 2022
Gift for someone who brews beer
Melissa M on Dec 16, 2022
Simple and stores easily.
Craig H on Aug 28, 2022
Past experience
Pierce R on Mar 23, 2022
Need cooler temperatures in summer
Robert G on Mar 9, 2022
My daughter needs it to home brew in a humid climate
Janice K on Dec 6, 2021
Already own one!
Anthony F on Sep 6, 2021
GREGG VAN O on Sep 1, 2021
Control fermentation temperatures
Chase H on Jul 15, 2021
Hot apartment
Daniel B on Jun 8, 2021
I bought this on a recommendation on a forum to keep my lager at a consistent, lower temp in a cost effective way.
Alonzo P on Apr 23, 2021
Limited space in fermentation area and good reviews
Nigel M on Nov 18, 2020
Has good reviews and I wanted to give it a go before trying out a more intricate automated system
Daniel H on Oct 8, 2020
It gets hot here in Alabama, hopefully this will allow me to ferment at decent temps.
Timothy B on Oct 8, 2020
I live in the South!!
Payton S on Jul 15, 2020
Fairly new to home brewing and did not want to invest too deep yet, but keeping fermentation temps under control is way too important to skimp on. This had really good reviews and I'm tired of swamp coolers
Aaron G on Jun 7, 2020
Cheapest solution available
Mark S on May 28, 2020
looks like a great and cheap way to keep my fermentation temp controlled
MICHAEL G on May 27, 2020
I wanted to save room in my fermenting fridge
James T on May 16, 2020
I wanted a second one.
Michael A on Jan 24, 2020
I aim trying to be able to maintain a stable temperature while fermenting beer in the summer months in AZ
Jennifer r on Dec 5, 2019
Already have one - works great. Want to lager this winter and need second unit.
Brian on Oct 19, 2019
Use with chilling fermenter
Gerald H on Oct 16, 2019
House is too warm in the summer for fermentation
Bill on Aug 28, 2019
My apartment is very hot in the summer and I don't have room for a large fermentation temp control solution
Joshua H on Jul 2, 2019
Lindsey J on Apr 19, 2019
I already have one and it works well with ice packs added.
Kandi R on Mar 27, 2019
Very convenient and affordable
Roberto T on Mar 8, 2019
It is an inexpensive way to handle fermentation temperatures.
Jim M on Jan 29, 2019
Easy way to better control ale fermentation
George S on Sep 3, 2018
For apartment brewing
katherine c on Sep 1, 2018
My Nephew referred it to me after I complained to him about my fermentation woes living in SoCal. He LOVES it!
Scott G on Aug 25, 2018
Leonard B on Aug 23, 2018
Hoping to control my fermentation better. Do not have the space for another fridge.
Gregory B on Aug 21, 2018
Need to better control temp in summer
Alan Lupinetti on Jun 26, 2018
Summers too hot
joel h on Jun 4, 2018
Need to cool fermentation
shawn r on May 23, 2018
Live in florida and needed something easy and doesn't take up much room to ferment my homebrew
David O on May 10, 2018
summer brewing, limiting esters, etc
__AD__ on May 1, 2018
I'm not ready to upgrade to an extra fridge.
David P on Apr 19, 2018
cool wine fermentation to 60 degrees
JEFFREY S M on Apr 16, 2018
Hopefully better than my failed homemade one
John S on Apr 5, 2018
It was highly recommended by a home brewer.
carlos t on Feb 19, 2018
california weather
Jeff I on Jan 22, 2018
Simple and stores easily.
Craig H on Aug 28, 2022
Need cooler temperatures in summer
Robert G on Mar 9, 2022
How easy is it to access the fermenter tap using the cool brewing fermentation cooling bag?
Francis Hammond on Aug 20, 2021
BEST ANSWER: Are you referring to fermenters with a spigot? I think you would need to take the fermenter out to do that. The "lid" of the cool brewing bag does have a 5-6 inch slit with a zipper closure. I have 2 and 3 gallon fermenters with spigots and I take them out to do gravity samples or taste. Otherwise this bag does a great job of keeping fermentation temp under control and is very easy to use. Hope this helps.
Does the cool brewing fermentation cooling bag have an opening at the front to access a fermenter tap?
Francis Hammond on Aug 20, 2021
BEST ANSWER: No it doesn't have an opening for a tap but it works great for helping to cool Glass and PET carboys of 5-6.5 gallons. When used with a iced water bottles, a coolstix and an INK Bird temp controller- it does a great job in keeping lagers cool during fermentation.

4.7 / 5.0
55 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
Rated 4 out of 5
Keeps your fermentation cool as advertised but interior not too robust
I am very pleased with how the Cool Brew kept my primary fermentation at a cool 58 F with only the minimal task of changing 2, 2 liter bottle ice bombs every 24 hours. What I'm not so pleased about is that a very small slice/tear has shown up on the bottom of the interior case. I'm not sure if it was there when I started, but the case only had a Speidel 30L plastic fermentation barrel holding about 6 gallons of Sauvignon Blanc juice. It was not moved when changing ice bombs. Now I'm wondering how I should repair this little slice.
Slice/tear in bottom interior of Cool Brew after one use.
Slice/tear in bottom interior of Cool Brew after one use.
February 29, 2024
Rated 5 out of 5
Great cooler bag!
Nice alternative for those like me who don’t have the space or funds to immediately jump into an automatic temperature-controlled setup for lagering or lower temp fermenting. Maintains cooler temperatures with frozen half gallon and full gallon containers. This was exactly what I was needing to advance my brewing journey.
November 17, 2022
1 year ago
Rated 5 out of 5
Keeps fermentation temperature very well
September 27, 2022
1 year ago
Rated 5 out of 5
Beats a swamp cooler!
I was able to maintain 10 degrees below room temp with a few one liter ice bottles. Seems well made.
September 28, 2021
over 2 years ago
Rated 5 out of 5
Lager fermentation Aid
Using the brew bag in conjunction with a coolstix and with an ice water reservoir allows cool fermentation to be accomplished without a fermentation chamber.
May 28, 2021
over 4 years ago
Rated 5 out of 5
Great gift for my husband’s new hobby of brewing beer.
October 29, 2020
over 3 years ago
Rated 5 out of 5
Works well
My house temperature normally holds at 76 degrees. This bag brings the temperature down to 70 degrees when I use two 1 gallon jugs of ice.
October 21, 2020
over 3 years ago
Rated 5 out of 5
great addition
Probably could have built something comparable, but this is a great investment if you want to add a layer of temperature control that doesn't involve a refrigerator. Using recycled 32oz gator-aids as ice cubes... I use about 6-8, rotating every half day roughly to keep fermentation temps in the mid-high 60s in my basement that can reach up to 84* (dehumidifies generating heat). Folds easy, has a carry strap and there's plenty of room for my 7gal SS brewtech fermentor and blow off bucket.
September 8, 2020
over 4 years ago
Rated 5 out of 5
This thing is great!
I’m super impressed with how well this thing kept my fermenting temperature where I wanted it with minimal fluctuation. July in the New Mexico desert can be pretty brutal and a swamp cooler can only do so much. I just made sure to check the temperature 4 to 6 times per day and added or subtracted little frozen water bottles as necessary. Taking notes (time of day, ambient temp, how many bottles added/subtracted, etc.) every time you check temp is incredibly helpful...
July 25, 2020
over 4 years ago
Rated 5 out of 5
I was worried about this bag and how to manage large temperature changes when adding ice. I have relied on swamp coolers for years but can manage +/- 1 deg with them. This bag was a mystery until I inserted my old Johnson controller probe into a jar of water in it. It is amazing - I use small frozen water bottles. 1 every 10-12 hours and I keep */- 1 deg again in much less space, much less need of filling freezer with frozen bottles. I think with the larger bottles I’ll even be able to lager in it! But get a temp probe to take out the guesswork.
March 2, 2020
over 4 years ago