Pack less clothing than you think you'll need. For shorter trips, we're big fans of the 1-2-3-4-5-6 Rule for packing: 1 hat, 2 pairs of shoes, 3 pairs of pants or skirts, 4 shirts, 5 pairs of socks and 6 sets of underwear. It works for long trips, too, as long as you can do laundry once a week.