These jars are a cheap way to experiment with your homebrew. They are for those of us who like to compare the effects of say, dry hopping with different hops, or adding different fruit flavors/ flavor combos, or trying the effects of different yeast strains on the same base beer. You can simply brew a regular 5 gal batch, pour it off to (5) 1 gallon jars, or some into a 3 gallon carboy and the rest into (2) 1 gallon jars (my go-to choice). So even if you don't get the best results in the world- it's only 1 gallon that you sacrificed, and hey- you learned something by doing it. And unless its contaminated, it's probably still good enough to drink as a "failed attempt." Better than bud light at it's best (which is done on purpose believe it or not!)