Packing a suitcase gives you the chance to clean out your closet. Remember that shirt or pair of jeans you bought and swore you would wear but still has tags on it? Instead of tossing it back into the keep pile, auction it off on eBay. You can set a timer so the auction ends when you want it to, and you won't have to worry about it while you're away. When you come back, you'll be able to cash in on all of your offers.