In 2026, the ability to take feta cheese on a plane depends entirely on whether it is packed in brine (liquid) or is dry-crumbed. According to TSA and international "3-1-1" security rules, any food item that is "creamy, spreadable, or packed in liquid" is considered a liquid/gel. Because traditional feta is often submerged in a salty brine, it is usually restricted to containers of 3.4 ounces (100ml) or less if carried in your hand luggage. If you have a large block of feta in liquid, it must be placed in your checked luggage to avoid confiscation at the security checkpoint. However, if the feta is dry, crumbly, or vacuum-sealed without excess liquid, it is generally treated as a solid food and can be brought through security in any quantity. For international travel, you must also consider customs regulations; many countries, including the U.S. and Australia, have strict rules about importing fresh dairy products to prevent the spread of animal diseases. Always declare "cheese" on your customs form to avoid fines, even if the item is permitted.