Yes, you can bring foundation in your carry-on, but it must adhere to the TSA 3-1-1 rule for liquids. In 2026, any liquid, cream, or gel foundation must be in a container that is 3.4 ounces (100ml) or smaller. All such containers must fit comfortably inside a single, clear, quart-sized, zip-top bag. If your favorite foundation comes in a larger bottle, you will need to decant it into a travel-sized container to pass security. However, if you use a powder foundation or a stick foundation (solid form), these are not subject to the liquid volume restrictions. Powder makeup in quantities greater than 12 oz (350 ml) may require additional screening, so it is best to place large powder containers in a separate bin. For "squeezable" or wand-applicator concealers and foundations, security treats them as liquids, so always ensure they are tucked into your clear quart-sized bag to avoid delays during the X-ray process.