The perfect size especially the top section for brewing small test batches works great!!

The Fermonster is superior to using a white plastic fermentation bucket with a solid white lid. The Fermonster seals well so that the airlock is the only way for the C02 to escape. Between monitoring the gas escaping from the airlock and a visualization of the clear plastic tub, a far better determination of the state of the primary fermentation can be made with the Fermonster. The stopper is a must have accessory. (pun intended) and an extra gasket plus a solid lid helps when it comes time to degassing.

Very small Wish i went with the 3 gallon

super convenient, easy to clean. great for split batches or small experimental batches.

Works well. Easy to clean. A no frills car boy that performs as expected. Sidewalls are very thin and I expect they would not hold up well in hot water. Used to ferment kombucha and vegetables.

I bought this to make it easier for my wife to do larger batches of cold brew coffee. 12oz coffee and 3 qts of water and in the fridge it goes. She loves it.

Pros:* Lightweight!* Won't shatter like glass.* Large mouth makes cleaning a piece of cake.* Slightly larger than 1 gallon, so I can actually bottle nearly that much.Cons:* As many have said, the thin walls make me feel like I'm going to collapse or dent it.* The o-ring provided for the lid doesn't stay on. Pretty sure it's going to fall into my beer, so I threw it away. It keeps a seal without it anyway.* The dent where the spigot might go is annoying and unnecessary (I'm never putting a spigot on it).* The larger-than-normal stopper required is not easy to find. I ended up fabricating a 2-hole of the right size and did not enjoy the experience.

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.

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.