You are allowed to bring liquids, aerosols, gels, creams, and pastes in containers of 3.4 ounces (100 milliliters) or less each in your carry-on baggage. All these containers must fit within one clear, resealable quart- sized (about 1 liter) plastic bag per passenger. This is known as the TSA 3-1-1 liquids rule. There is no limit on the number of containers as long as they fit in the quart-sized bag

. Exceptions include medically necessary liquids (such as prescription medications, baby formula, and breast milk), which can be carried in larger quantities but must be declared and presented for inspection

. Liquids purchased after passing through airport security (such as duty-free items) are not subject to the 3.4 oz limit if they remain sealed in tamper- evident packaging with the receipt

. For checked baggage, there are generally no strict limits on liquid quantities, but items must be packed securely to prevent spills, and some airlines or countries may have specific restrictions

. In summary:

• Carry-on liquids: containers ≤ 3.4 oz (100 ml), all fitting in one quart-sized bag
• No limit on the number of containers, as long as they fit in the bag
• Medically necessary liquids allowed in larger amounts with declaration
• Duty-free liquids allowed if sealed and with receipt
• Checked baggage liquids have fewer restrictions but must be packed carefully

This rule applies broadly for flights in the U.S. and many other countries following TSA or similar regulations