Though your 16-ounce iced coffee has no hope of making it through security, there are certain larger containers of liquids, gels, or aerosols that you’re allowed to bring onto the plane. MedicationAny “medically necessary liquids, gels, and aerosols in reasonable quantities for your trip” should be fine, according to the TSA. Breast Milk or FormulaAdults traveling with infants or toddlers don’t need to confine breast milk or formula to 3.4.-ounce containers. The TSA officer usually X-rays the liquids and might even open the containers, but you can ask them not to. Water, If There’s a Live Fish in ItSeriously, you can travel with your goldfish “in water and a clear transparent container” that exceeds 3.4 ounces.