The prohibited items on airplanes are Liquids, Aerosols, and Gels (LAGS) are subject to strict limitations to prevent liquid explosives. In carry-on baggage, LAGS must be in containers of 100ml or less and placed in a clear, re-sealable plastic bag. Larger quantities are generally allowed in checked baggage, but check airline regulations. Exceptions might be made for essential medications with proper documentation. Baby food and milk for infants are usually permitted. Remember, these rules can vary between airlines and countries.
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