Always carry your passport, valid visas, and travel insurance documentation securely. Keep physical and digital copies separately as backups. Many countries require proof of onward travel, accommodation bookings, or vaccination certificates at entry. New 2025 requirements include digital arrival forms for India, Indonesia, and Thailand. For U.S. domestic flights starting May 7, 2025, REAL ID-compliant identification is mandatory. Organized document management facilitates smooth border crossings and emergency situations.