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Fermonster 1 Gallon Carboy

Fermonster 1 Gallon Carboy

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The Fermonster is a brand new 1 gallon carboy designed specifically for small batch fermentation. MoreBeer! gave product feedback for over 2 years of development and we think they nailed the design. The large lid of this 1 gallon carboy allows for easy filling and makes hop or oak additions a breeze. The smooth sides are fantastic for sanitization - no ribs or texture to collect yeast or bacteria. The punted bottom allows sediment to collect to the sides so that you can siphon liquid from the center.  Because they are made from vigin PET plastic they nearly unbreakable and a lot safer than similar glass carboys.

Made from heavy PET plastic, the same material used in 2 L soda bottles, which is nearly impermeable to oxygen penetration.  Due to the thickness of the material and the overall geometry the Fermonster does not require ribs or dimples for stability.  That results in a super smooth interior surface that reduces yeast and sediment buildup making it the easiest to clean, most sanitary PET carboy on the market.  The huge 4" opening of this 1 gallon carboy makes filling a breeze, and cleanup is as easy as wiping down the inside.

These fermentors are completely air-tight and the lids sealed tight with an O-Ring.  Additional O-Rings and Lids both with and without holes are available for purchase, see our You Might Also Need items below.

Fermonster 1 Gallon Carboy Features:

  • 4" inner diameter wide mouth carboy - easy to clean!
  • Food grade PET plastic construction is nearly impermeable to oxygen penetration
  • No hard to clean dimples or ribs
  • Punted bottom
  • O-Ring and Lid with one hole is included (Fits #10 Stopper)
  • Additional O-Rings and Lids available
  • Weight: 0.6 lbs
  • Temperature Limit: 140° F
  • Height: 9.45 inches
  • Diameter: 6.7 inches
  • Completely taste and odor free
  • Perfect for Beer, Wine, Cider, Mead, Kombucha or any other fermented beverage!

Please note: the pictured #10 Stopper (FE470VS) and three piece airlock (FE370) are not included.

Item # FE259
Shipping Eligible for Free Shipping Program
Availability California - In Stock
Pennsylvania - In Stock
Weight 0.59LBS
Community Q&A

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Why did you choose this?
MoreFlavor Store
Best fermenter for 1 gallon wines and meads
Steven McPeak on Aug 8, 2018
trying out a plastic one gallon carboy
Sal Coco on May 1, 2018
Best fermenter for 1 gallon wines and meads
Steven McPeak on Aug 8, 2018
Easier than glass jug
Steven McPeak on Jul 31, 2018
trying out a plastic one gallon carboy
Sal Coco on May 1, 2018
Easier than glass jug
Steven McPeak on Jul 31, 2018
What size stopper needed?
Jonathan Manatt on Apr 14, 2018
BEST ANSWER: The Fermonster 1 gal. takes a #10 stopper.

3.7 / 5.0
3 Reviews
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1 Star
The good news and bad news are the same; The carboy is light with a wide mouth. this is easy to work with and clean, but the lack of weight and flexibility makes this carboy difficult to handle when working with it since it will tip over easy and crumble with the slightest of pressure like tightening the lid down or implementing a siphon.
September 6, 2018
3 months ago
Mixed up a 1 gallon batch of Blackberry Mead. The shape and wide mouth opening is perfect for degassing and adding nutrients. Much lighter than glass without the danger of dropping and breaking. Easier to clean than a gallon jug. I like the wide opening for the bung too, don't have to unscrew the lid to take a reading or add to the batch.
August 5, 2018
4 months ago
Pretty thin plastic
I got my 1 gallon Fermonster in today. I have four of the 6 gallon versions and love them. The 1 gallon versions aren't as thick and flex very easy like a cheap water bottle. I'll do an update after a few uses, but my first impressions aren't looking to great.
July 20, 2018