Getting rid of your belongings can be painful. Literally. And according to research, the longer you hold on to an item, the harder it becomes to get rid of it and the more you value it. This even applies to seemingly worthless items like junk mail, for God's sake. So when it comes time to clean out your closet or garage or whatever, make sure to use black garbage bags. This way you'll say goodbye to unwanted belongings and have no opportunity to stare them in the eye as they sit in your junk pile. And no peeking!