4 ounces (100 milliliters) or less. The item must be completely frozen when you go through the checkpoint; if it is partially melted, it will be subject to the liquid restrictions.
Freezing Toiletries for Long Flights: A Practical Security and Travel Strategy
Furthermore, all of these small containers must fit comfortably inside a single, clear, quart-sized plastic bag. It is recommended that you declare these items to the officer upon arrival at the checkpoint to facilitate a smoother process.
Formula, breast milk, juice, and other liquids necessary for feeding a child are allowed in quantities beyond the 3-1-1 rule. Infant and Child Essentials Traveling with infants and young children requires some flexibility regarding toiletries.
Freezing Toiletries for Long Flights
Remember that the cabin crew on the aircraft is not responsible for enforcing security rules, but they do enforce the airline's carry-on size limits. For long-haul flights, freezing your toiletries can be a practical solution.
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