When packing for a flight to Manila from Singapore, it's essential to consider the tropical climate and your specific travel needs. Key items to include are lightweight and breathable clothing, comfortable footwear for walking and exploring, sun protection like hats and sunscreen, and travel adapters if you plan to charge your devices. It's advisable to carry a reusable water bottle to stay hydrated during your journey. However, avoid packing items that could be restricted or confiscated at customs, such as illegal substances, firearms, or large quantities of liquids exceeding the airline's regulations.