[Grumpy_G]

Straight from the Red Star Page:

‘BULK’ YEAST INFORMATION and STORAGE TIPS

The 16oz and 32oz packages of yeast are part of our industrial product line and typically used in bakeries or foodservice. The package is vacuum-packed and should be hard like a brick prior to opening. Once the package is opened, the yeast is free-flowing and must be stored airtight and cold to maintain its leavening power. You may store it in an airtight container, or many people store it in zipper freezer bags, squeezing air out of the bag to the level of the yeast, then sealing the bag. The yeast should be stored in the freezer.

Since it is so dry, it will never freeze solid.

For best results, dry yeast should be used at room temperature before using. Prior to use, measure or weigh only the amount you need and bring to room temperature for about 20 – 30 minutes. Immediately re-seal the bag or container and return the remaining yeast to the freezer.”