1. The bigger your suitcase, the more you will put into it: The simplest way to avoid bringing too many things is to buy a hard-sided suitcase, no more than 22 inches tall (so it can work as a carry-on) with a structured shell so you can’t squeeze in any extras.
2. Do the clothing countdown: If you need a mantra to help streamline your wardrobe, use the 5, 4, 3, 2, 1 rule for a weeklong trip: Limit yourself to no more than five sets of socks and underwear, four tops, three bottoms, two pairs of shoes and one hat. The list should be adjusted to suit your needs. Throw in a swimsuit and exercise gear or a suit jacket and dress if you’ll need them.
3. Lay out what you think you’ll need, then edit ruthlessly: “Think twice about everything you want to put in your bag,” said Ben Nickel-D’Andrea, who writes about flying first-class with his husband, Jon Nickel-D’Andrea, at , part of the BoardingArea blogger network. The jet-setting couple once flew to Morocco for nine days with only carry-on bags and backpacks. “Fully get rid of the ‘just in case I need it’ category,” he said. “If and when you need it, you can buy it.”