Not sure I want this one associated with me. Can I change my name? Oh, wait. Never mind. I know how to do this.
From a friend: When you have socks and underwear with holes and torn seams and stretched out elastic and you're about to throw them out, put them aside instead, and pack them when you travel. You can get one more day's wear out of them, then toss them in the garbage at night. You'll have less dirty laundry to shlep around or rinse in the hotel sink, and by the end of the trip you'll have more room in your luggage for souvenirs.