All liquids, including makeup, lotion, and other cosmetics, must be in containers no larger than 3.4 ounces in carry-on luggage. (For checked baggage, you can bring pretty much any size.) Powdered makeup, bar soap, and solid deodorant are usually allowed in larger containers. You'll also want to put all liquid beauty and personal hygiene products in a clear plastic bag before going through airport security. You can review the TSA's official liquids rules here.