When packing for an international flight in 2026, certain items are strictly prohibited in checked luggage due to safety and security regulations. Most importantly, lithium-ion batteries (including power banks and spare laptop batteries) and vapes/e-cigarettes are banned from the cargo hold because they pose a fire risk; these must be kept in your carry-on. You should also never pack irreplaceable valuables, such as jewelry, cash, original travel documents (passports/visas), or essential medications, as checked bags can be delayed, lost, or subjected to theft. Flammable items like aerosol paints, fuels, and certain high-proof alcohols (over 70% ABV) are also prohibited. For international travel, avoid packing fresh produce, meats, or unlabeled spices, as customs and agricultural agents at your destination may confiscate them and issue steep fines to prevent the spread of pests and diseases. Lastly, avoid packing "loose" electronics or glass items without extreme padding, as the automated sorting systems and pressure changes in the cargo hold are notoriously rough on fragile belongings.