You are allowed to bring liquids, aerosols, gels, creams, and pastes in your carry-on bag only if they are in containers of 3.4 ounces (100 milliliters) or less per item. All these containers must fit within a single quart-sized, clear, zip-top bag. Each passenger is limited to one such quart-sized bag for these items

. There is no specific limit on the number of 3.4-ounce containers you can bring, as long as they all fit inside the one quart-sized bag

. Exceptions exist for medically necessary liquids (like prescription medications, baby formula, and breast milk), which can be carried in larger quantities but must be declared and presented separately at security

. In summary:

• Maximum container size: 3.4 ounces (100 ml)
• Total liquids must fit in one quart-sized clear bag
• One quart-sized bag per passenger
• Medically necessary liquids can exceed this limit with declaration

This is commonly known as the TSA "3-1-1 liquids rule"