how many ounces can you take on plane

You can take liquids on a plane in containers of up to 3.4 ounces (100 milliliters) each. All these containers must fit within one quart-sized, clear, resealable plastic bag, with only one such bag allowed per passenger. This is commonly known as the TSA 3-1-1 rule. There are exceptions for medications, baby formula, and breast milk, which can be carried in larger quantities but must be declared at security. Liquids purchased after the security checkpoint, such as duty-free items, can exceed these limits if kept in the tamper-evident sealed bag with a receipt. There is no size limit on liquids in checked baggage, but they must be properly packed to avoid leaks.