Weigh all ingredients into a large airtight container, add the lid, and shake it up several times, in all directions. Remove the lid and give it a good whisk.
For larger quantities, simply slide the servings slider to the right until the proper amount is reached. I always make 2.8kg (20 cups).
Flour blend will keep in a tightly sealed container in a dark, cool closet or pantry for up to three months