You are allowed to bring liquids, aerosols, gels, creams, and pastes in your carry-on bag through airport security if they follow the TSA's 3-1-1 liquids rule:

• Each container must be 3.4 ounces (100 milliliters) or less.
• All containers must fit within one quart-sized (approximately 32 ounces) clear, resealable plastic bag.
• Each passenger is limited to one such quart-sized bag.

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

. Exceptions include:

• Medically necessary liquids (prescription medications, baby formula, breast milk) can be brought in larger quantities but must be declared and presented separately at security

• Liquids purchased after security screening, such as duty-free items, do not count toward the 3-1-1 limit if they remain sealed and accompanied by a receipt

For checked baggage, there are generally no TSA-imposed limits on liquid quantities, but airlines and international regulations may apply, and liquids must be packed securely

. In summary, for carry-on luggage, the key limits are containers of 3.4 ounces or less, all fitting in one quart-sized bag per passenger. Larger quantities must go in checked baggage or qualify for exceptions like medical necessity.