Knowing customs rules – for both your destination and your return to the UAE – avoids hassle. Every country bans certain items outright: narcotics, weapons, offensive materials are universal no-nos. Check rules for drones and counterfeit goods too. Then there are restricted items, often allowed in limited quantities but needing declaration. Alcohol rules vary wildly: KSA prohibits it entirely, while others allow amounts for non-Muslims (check purchase rules, especially at land borders). Tobacco has specific limits per country. Large amounts of cash (usually over $10k equivalent) need declaring. For personal medications, carry them in original packaging with a prescription; check rules for controlled meds, especially for the UAE. Food imports are often restricted. Duty-free allowances also differ everywhere. Returning to Dubai, you can generally bring gifts up to AED 3,000, up to 4L of alcohol (non-Muslims), and 400 cigarettes duty-free. Always check official customs websites (like the UAE's ICP) before you travel.