Author Elaine St. James explains how she deals with clutter in Simplify Your Life:
Put them in a box with a label indicating a date two or three years from now—but don’t list the contents on the label. Store the box in the attic or the basement, or wherever is convenient. Once a year, examine the labels. When you come across a box whose date has passed, throw it out without opening it. Since you don’t know what’s inside, you’ll never miss it.