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Big Mouth Bubbler® EVO 2 - 5 Gallon Glass Fermentor w/ Carrying Harness

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The fermenter that started it all, reinvented again! We've taken the revolutionary Big Mouth Bubbler® glass and re-engineered it with the help of world-class Polish master glassmakers to ensure sturdy, solid, superior craftsmanship.

Now Includes the Big Mouth Bubbler® carrying harness for lifting, transporting and ensuring your Big Mouth Bubbler lid stays firmly in place during even the most intense fermentations.

Extra-thick glass eliminates oxygen permeation and keeps your brew safe. Banish bugs and bacteria with perfectly air-tight seals from a carefully ground, completely smooth and obsessively flat neck top.

In the evolution of Big Mouth Bubbler®, we've added some perks! Instantly measure volume with gallon graduation marks. Easier transfer of clear beer with a taller, narrower body while ensuring less liquid is left behind.

5 gallon fermenters are best for the secondary conditioning stage of beer fermentation similar to a traditional 5 gallon carboy. The smaller size eliminates extra airspace in the fermenter reducing the chances of oxidation which can stale the beer prematurely. Also available as a 6.5-gallon primary fermentor.

Caution: Big Mouth Bubbler® is a large hand-formed glass item that can be easily damaged if not used with proper care and handling. It may have variations in shape and thickness, and will show the normal bubbling characteristics of hand-formed glass. Extreme changes in temperature or sudden contact with hard surfaces may cause glass to crack. Handle with care. 

Bid your funnel and siphon sayonara! Pour cooled wort directly from your kettle into the Big Mouth Bubbler® for instant transfers. Pitch yeast without it running down the sides of your fermentor. Easily add flavorings to secondary, and then just as easily remove them!

Gallon graduation markings help ensure precise measurement of fermenter volume.

Last but not least, you asked and we listened: more space for the adhesive FermagraF° LCD thermometer than any other glass fermentor! The most obsessively engineered glass fermentor ever created. We are proud and excited to introduce the new and improved Big Mouth Bubbler® EVO 2.

Each 5 Gallon Big Mouth Bubbler® Includes:

  • Big Mouth Bubbler® Glass Fermenter, Universal Lid*
  • Big Mouth Bubbler® Microfiber Cleaning Cloth
  • Big Mouth Bubbler® Carrying Harness

*The new Big Mouth Universal Lid (included) fits all Big Mouth Bubbler® Fermentors. The Big Mouth Bubbler® Universal Lid is just like a traditional carboy bung, only bigger! Just as easy to sanitize and set in place too. Ribbed silicone rings ensure a positive seal to keep out pests, while the non-threaded design allows the lid to move preventing an out-of-control fermentation from dangerously pressurizing your fermentor.

You will also need a Small Universal Carboy Bung - drilled or solid.


Product SKU 41325 (5 Gal.) 41326 (6.5 Gal.)
Weight 13.5 lbs. 16.5 lbs.
Height (w/ lid, closed) 18" 17.5"
Diameter 10.25" 12"
Mouth Diameter 5.25" 5.55"


*Pro Tip: Save your box and use it as a cover for your fermenter!

Additional information



Customer Reviews

Based on 81 reviews

Nice fermenter. Lid has a bit of trouble staying on if you don’t have the harness. So...yeah, get the harness too.


Perfect for 5 gallon Secondary or small batches brews


Easy to clean and handle.

Volume too small

I purchased two of these and I found out that when you have 5 gallons inside and the lid is on there is little to no space between the lid and the liquid. The design of the small mouth 5 gallon carboys has plenty of room when filled with 5 gallons. These should have been designed to be 5.5 gallons. I am pitching mine out in the garbage and replaceing with the 6.5 gallon models. I wasted a lot of money on these.

I am sorry to hear you do not like the 5 gallon Big Mouth Bubbler EVO 2 fermentor. It should have horizontal gallon markers on the side of the fermentor, which are well below the neck of the carboy. I would not recommend the 5 gallon for primary fermentation as you may need more room for the krauzen during primary fermentation, but it would work well as a secondary fermentor or a primary for smaller than 5 gallon batches. If you aren't completely satisfied with the product, you do have a 30 day return policy.
Great upgrade!

For me, cleaning access and ease of dry hopping are the biggest advantages. So far is performing as expected.The only critique is that the lid is not staying seated. I use tape to keep it down.

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Big Mouth Bubbler® EVO 2 - 5 Gallon Glass Fermentor w/ Carrying Harness

Big Mouth Bubbler® EVO 2 - 5 Gallon Glass Fermentor w/ Carrying Harness

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