You can bring liquids, aerosols, and gels in containers of 3.4 ounces (100 milliliters) or less each in your carry-on luggage. All these containers must fit within a single clear, resealable quart-size (about 32 ounces) bag, and you are allowed only one such bag per passenger. This is known as the TSA 3-1-1 rule: 3.4 ounces per container, 1 quart-size bag, 1 bag per passenger

. In terms of quantity, you can carry as many 3.4-ounce containers as will fit in the quart-size bag, typically about 6 to 9 small bottles, which translates to roughly 20 to 30 ounces total, depending on container shapes and packing

. There are exceptions for medically necessary liquids (such as prescription medications, baby formula, breast milk), which can exceed these limits but must be declared and presented separately at security

. Liquids purchased after clearing security or duty-free liquids in sealed packaging with a receipt are not subject to these restrictions

. Any liquids over 3.4 ounces must be packed in checked baggage to be allowed on the plane

Summary:

• Maximum container size: 3.4 ounces (100 ml)
• All containers must fit in one quart-size clear bag
• One bag per passenger
• Total liquid ounces depend on how many containers fit in the bag (about 20-30 oz)
• Exceptions exist for medical and baby-related liquids (must declare)
• Liquids over 3.4 oz go in checked baggage

This is the current TSA standard for liquids in carry-on luggage.