This document describes CHOOZIT® AMERI-FLEX, a one-bag direct to vat culture system for producing American style cheeses like cheddar, colby, and Monterey jack. It offers two formulations to provide flexibility for different processing conditions. CHOOZIT® AMERI-FLEX provides consistent acidification from vat to vat and day to day, helping cheesemakers manage production complexity and meet demands for various cheeses.