The signature conical base of the Brew Bucket minimizes potential off flavor yeast contact during fermentation, and allows the yeast to concentrate for a clean transfer. All sizes of brew buckets fit nicely into standard chest freezers for convenient temp controlled fermentation.� And of course one other very popular and unique feature of our design is that Brew Buckets can be stacked during use!� Not to mention a nice assortment of custom accessories we've made for these.