Pack a small, separate bag for toiletries. (Liquids, gels and aerosols packed in carry-on must follow the 3-1-1 liquids rule: 3.4 ounces or less per container; all liquids must fit in one quart size, clear, plastic, zip-top bag; one bag per passenger.) Roll your clothes tightly to save space in your luggage.

Millions of Americans are hitting the road, skies and seas for the Fourth of July, with the Federal Aviation Administration and the American Automobile Association both predicting record travel numbers this week.