I have a chest freezer that I want to use to control fermentation temperature, that I'm hoping to use to with two five gallon beer batches. Unfortunately, the bottom of the freezer has two levels, making it impossible to load two round carboys into the freezer at the same time. There is plenty of space for the beer volume if I can get a carboy of the proper dimensions.

Is is possible to a make a custom carboy shaped to use the space more efficiently? Can plastic sheets of the same type used in carboy buckets be purchased easily?

  • Ran into exactly this problem last weekend. I'm about 6 inches short. You must have the same model of freezer as I do. :D Commented Nov 5, 2012 at 22:35
  • Could be, but I don't have a problem with vertical space.
    – mbergins
    Commented Nov 9, 2012 at 23:57

3 Answers 3


I'd try making a collar for your freezer lid to raise it and make room for your fermenter. Far easier and more realistic than trying to build a fermenter.


Look at the usplastics site. They have food grade containers that are more rectangular. Yes, they are not glass, but plastic is fine anyway.


Any food-grade container can be used as a fermenter, so yes you can build/buy whatever shape you want.

  • Why preferably glass? Commented Nov 5, 2012 at 22:35
  • some say plastic will leach into the beer, where glass will not. It really depends on how long the beer will sit. if it was a few weeks, then there is no harm. a few months then maybe I would go for a stronger material, but that could just be a boogie-man of home brewing. plexi-glass may be a good choice for building a secondary fermenter too. Commented Nov 6, 2012 at 3:41
  • 4
    I have been using plastic fermenters exclusively for 12 years after switching from glass. There is no problem using buckets, or with leaching.
    – Denny Conn
    Commented Nov 6, 2012 at 16:31
  • there you go :) glass is the default type but it doesn't have to be. Commented Nov 6, 2012 at 18:18
  • Stainless steel is also a good option, though expensive. Commented Nov 6, 2012 at 18:23

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