According to the standard TSA "3-1-1" rule in 2026, each passenger is strictly limited to one quart-sized, clear plastic bag of liquids, gels, and aerosols in their carry-on luggage. You cannot take two or more bags of liquids for yourself, even if they are small. All individual containers inside that single bag must be 3.4 ounces (100ml) or less. If you have more liquids than will fit in one quart-sized bag, you must pack the excess in your checked luggage, where there are no size restrictions (except for certain hazardous materials or high-proof alcohol). There are, however, important exemptions to this one-bag rule: medically necessary liquids (like insulin or saline), baby formula, and breast milk are allowed in reasonable quantities exceeding 3.4oz and do not need to fit inside your primary quart-sized bag. These exempt items must be declared to security officers for separate screening. For everyone else, the limit remains one bag per traveler, enforced to ensure the efficiency of the X-ray screening process.