I absolutely do not want to keep seldom used specialty items on the pantry shelves. Cake flour is something that I may use once a month, at most, and I don't want to have it go bad before I can use it up. I have found a homemade substitute for cake flour that is easy to make.
In a cup measure place 2 Tbsp. of cornstarch in the bottom, then fill to the top with all purpose flour. You are basically replacing 2 Tbsp. of the flour with cornstarch. Sift well and you will now have the equivalent of 1 cup of cake flour.
This replacement cake flour results in a light, soft cake.