Instead of growing yeast in traditional stainless steel fermenters, the patent-pending FlexCell™ process uses a flexible container to propagate the yeast and package it in the same material, reducing the risk of contamination to create yeast that has never been exposed to the environment. The result of White Labs' FlexCell process is the new PurePitch™ homebrewer-size packaging, which is made from a recyclable, flexible film allowing for increased breathability, reducing the chance of gas buildup and maintaining an optimal environment for the yeast. The new homebrew size packaging will appear in retailer and customer orders starting fall 2014.