Packing with one carry-on means that all your liquid items must fit inside a quart-sized bag.  Not only that, but each item must be 3.4 ounces or smaller.  They call this the 3-1-1 Liquids Rule.  “Liquids, gels, aerosols, creams and pastes must be 3.4 ounces (100ml) or less per container; must be in 1 quart-sized, clear, plastic, zip-top bag; 1 bag per passenger placed in screening bin.”

Here are a few things things that DO count as liquids, that you may not have considered: 

• Mascara
• Lip gloss (and Blistex)
• Liquid eye-liner
• Gel medications, such as Advil Liqui-gels
• Eye drops
• Aerosol bottles