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Sort Through Makeup
Purging: "Sort through all your half-empty bottles of shampoo, lotion, and makeup, and toss anything you haven't used in six months," Morgenstern says. Group what's left in containers of like products (i.e., rather than having 18 kinds of makeup sitting out on the counter, put it all in one easily accessible container). Morgenstern also uses extra toiletries (unopened, of course) to make hostess baskets for overnight guests.

Prevention: Avoid impulse purchases by buying products only to replace those you're done with.