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Big Mouth Bubbler® EVO 2 - 5 Gallon Glass Fermentor with 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.

Additional information




  • New Big Mouth Bubbler® Universal Lid
  • Big Mouth Bubbler® Microfiber Cleaning Cloth
  • Big Mouth Bubbler® Carrying Harness

The new Big Mouth Bubbler® Universal Lid fits all Big Mouth Bubbler® Fermenters. 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. Removable ribbed silicone ring ensures 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 fermenter.

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

Product SKU 42900 (5 Gal.) 42898 (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!

Customer Reviews

Based on 79 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.

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.


Havent used it yet, but first thing it seems nice quality. But I thinky it will be easier to clean if the embossing of words isnt on the inside. Just glss smooth would be best inside.Also

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Big Mouth Bubbler® EVO 2 - 5 Gallon Glass Fermentor with Harness

Big Mouth Bubbler® EVO 2 - 5 Gallon Glass Fermentor with Harness

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