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.

My apartment is 85 degrees in the summer and this ingenious solution keeps my 6.5 gallon fermentor at a cool 68 degrees!

I love this 2nd Generation Bag! There is no sagging down onto my airlock as my 1st Generation Bag did. Very Good Quality!

I don't have temp control at home so this device really comes in handy. I can fit two fermenters into the one bag and it still keeps my fermenter temps cool/cold and stable. Brewing lagers is easier now. I like to add multiple freezer packs and a frozen gallon size water jug at start of fermentation. This gets my wort to about 42-45F. I then wrap the Ferm bag with blankets and a sleeping bag and slowly allow my beer to free rise to about mid-50's (I've found this takes 2-3days depending on how many blankets I use). I then change out the ice packs as needed to maintain mid-50's temps. When FG is reached, I stop changing freezer packs so the beer temp will slowly rise to about 68F room temp for a D- rest. The ferm bag has also worked well for "cool conditioning" my beer several days before Kegging. Just add lots of freezer packs and wrap the bag with blankets. I think the fermentation bag is a great product. I might buy another one.

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.

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.

Keeps fermentation temperature very well

I was able to maintain 10 degrees below room temp with a few one liter ice bottles. Seems well made.

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.

Great gift for my husband’s new hobby of brewing beer.

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.

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.

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...

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.

My apartment is 85 degrees in the summer and this ingenious solution keeps my 6.5 gallon fermentor at a cool 68 degrees!

Ok this thing really will save you if you can’t get or don’t have the room for an extra fridge. The extra fridge you can probably buy used but if you’re like me I have a significant other already bothered by my fridges/freezers (3 in total) so this does help. So go get yourself 3-4 cheap 2 liter bottles from wherever. Freeze them and add essentially add one every 12-18 hours typically and voila you’ll be able to ferment within a decent range for your beer.

I have used this for several batches. I have fine tuned it with an addition of bubble wrap on the inside and a bedspread on the outside. With the house at 74, I can get the bag down to 33 for cold crashing. The only downside is that it produces condensation at lower temperatures.

I love this 2nd Generation Bag! There is no sagging down onto my airlock as my 1st Generation Bag did. Very Good Quality!

So far so good. Seems to hold the temp very well.

I'm using it to keep 3 1-gallon carboys cool and dark.

It's been holding temperature good

Cooler delivered as described. Can't wait to use on my next brew.

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!

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.

It works. Helps avoid volcanoes and keeps temp where it should be.

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!

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.

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.