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Cool Brewing Insulated Fermentation Bag
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The Cool Brewing Fermentation Cooler is a great way to lower fermentation temperatures, while keeping costs low as well.  This insulated fermentation bag is designed to hold a 5, 6, or 6.5 gal fermenter along with airlock while fermenting.  By simply adding in bottles of ice from the freezer, you can see a 30° F drop in the bag from ambient temperatures.

Not only will your customers produce better beer, but they will be less constrained to seasonal temperature changes.  Aside from working great to cool ferments during the summer, it functions just as well as a heated fermentation chamber during the colder months.  Pair the Cool Brewing Insulated Fermention Bag with a Fermwrap and temperature controller for precise heating control.

The Cool Brewing Bag has recently been further improved with the following updates:

  1. Thicker Insulation. This not only helps maintain cooler temperatures better, but also makes the cooler more rigid to stand up better on its own.
  2. A thicker internal liner. This helps keep the cooler even more durable as well as helping with temperature control.
  3. A heavier duty zipper. Specifically designed to accommodate thicker insulation and liner for improved durability.

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 5LBS
Community Q&A

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Why did you choose this?
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Easy way to better control ale fermentation
George S on Sep 3, 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
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 L on Jun 26, 2018
Summers too hot
joel h on Jun 4, 2018
Need to cool fermentation
Allison 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
Anthony D 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
For apartment brewing
katherine c on Sep 1, 2018
Leonard B on Aug 23, 2018

4.6 / 5.0
40 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
Very nice
I'm using it to keep 3 1-gallon carboys cool and dark.
July 12, 2018
3 months ago
It's been holding temperature good
May 31, 2018
5 months ago
Cooler delivered as described. Can't wait to use on my next brew.
May 18, 2018
5 months ago
Great product!
Love this thing! Kept my beer between 38 and 40 degrees for a week which allowed me to clear it beautifully with gelatin. Can’t wait to make a Vienna lager!
By switching out frozen bottles every 24 hours, kept beer between 38 and 40 degrees for a week.
By switching out frozen bottles every 24 hours, kept beer between 38 and 40 degrees for a week.
May 2, 2018
5 months ago
Great so far
Only one use but it maintained between 10 and 13 degree drop from ambient air temp. That was with just one half gallon milk jug frozen with salt water.
In fairness it was only a two gallon batch so it should have performed well.
Very rarely do I recommend something but this product is good enough to earn my endorsement.
April 23, 2018
6 months ago
Great bag.
It works. Helps avoid volcanoes and keeps temp where it should be.
February 8, 2018
9 months ago
Great Insulation
Works as it should! Lowers my ambient temps by 10-15 degrees. I even uses it in addition to a recirculating cooling jacket to keep a keg cold and force carb before I had my keezer built. Its water proof too!
January 23, 2018
9 months ago
I have been using this ferm bag for 2.5 years after using a tote with iced bottles to control temp. Initially, I filled the ferm bag with water and added iced bottles. That caused rapid cooling and some buffering of temp changes. It also cause condensation on the outside that was not desirable when sitting on carpet. Over time, I have stopped the use of water, but I found it less efficient due to an air gap between the iced bottles and carboy.

Currently, I add bubble wrap around the inside wall of the ferm bag and between carboy and bag's top. This keeps bottles tight against carboy and significantly increases efficiency.

I sit the bag on a few wood slats to avoid condescension issues. I also cold crash using the bag. With the addition of a bedspread on the outside, I can reach 36 degrees. It is a good product to start with and can be improved using additional insulation.
October 20, 2017
Perfect when using with Speidel Plastic Fermenter - 30L (7.9 gal)
So yea, works great here in Sacramento during the summer, swapping out frozen 2L bottles. Just like everyone else who loves this.

What I really like is that it is perfect with the Speidel Plastic Fermenter - 30L (7.9 gal). The height of the Speidel airlock is about the same height as the zipper on the Cool Brewing bag. The top of the airlock is actually a cap actually "floats" on top. When I zip the Cool Brewing bag shut, it pushes the air lock cap down a bit, making it harder for the gas to release.

This produces a louder pop/gurgle when the pressure equalizes and the gas eventually escapes. I find this beneficial, especially when fermentation slows. I know it's still going instead of trying to determine if it's just slow, or has stopped all together.

Before using the bag, gas still being produced would just seep slower, and silently without the force of the zipped bag pressing the airlock cap down. Using the bag, two weeks into fermentation, periodically I can still hear a "pop" (longer between intervals, naturally) telling me it's still going.
September 16, 2016
Was skeptical. Dual use giant cooler.
I use ferment buckets (FE361 -- tap the lids down with a mallet btw) for 4 week ale primary and there is plenty of room for ice around the sides and the top -- the insulated bag is huge. I could probably pack 20+ liters of ice around my buckets if needed. About 1 L of ice per -1F. I use an Oneida candy thermometer to help keep my temperature in range.

April 23, 2016