To ensure the longevity of the pancake mix, store it in an airtight container at room temperature. A large glass jar or an airtight plastic container works best. Homemade pancakes are so fluffy because when you make them from scratch, they have a chance to form more air bubbles. An easy trick to get a similar effect is to add approximately 1 tablespoon of carbonated water per person.
Carbonation will help them stand up and give you those fluffy pancakes you want. If you want to buy a pancake mix in bulk or store it for emergencies, here's what you need to know. Unless there are obvious rancid odors or visible mold, it's safe to use the pancake mix long after its expiration date. The pancake mix will only last about 2 years and you probably won't be able to review your reservation before it goes bad.
If the pancake mix has been stored for a long time, the yeast ingredients may have an unpleasant metallic taste. It depends on the size of the package, the type of product (how wet the pancake mix is) and the type of desiccant. The reason to use a desiccant when storing pancake mix is because powdered milk and yeast ingredients are very sensitive to moisture. When stored this way, the pancake mix should last 2 to 3 years, but still be sure to rotate between the reserves.
You don't have to repackage this pancake mix, but you should still try to use it before the stated expiration date. However, the leavening ingredients in the pancake mix will likely no longer work, so the pancakes won't rise. For this reason, it's best to store pancake mix in airtight plastic containers, glass jars, or sealed Mylar bags.