As a general rule, it is best to store your ink pads upside down. This ensures that the ink will be evenly distributed on the pad, and that the pad will not dry out. There are a few exceptions to this rule, however. If you are using an ink pad that has a felt tip, for example, you may want to store it right side up so that the tip does not become saturated with ink. And if you are using an ink pad that is particularly old or dried out, storing it upside down may not make much of a difference.