On flights by Delta or any other airlines, the Transport Security Administration of the Department of Homeland Security allows each passenger to carry on a sealed, quart-sized plastic bag of liquids in containers of 3.4 ounces or less. The TSA makes exceptions to allow larger quantities of liquids if they are medications or nourishment for babies or children. Passengers can bring larger containers of liquids in their stored check-in baggage if the liquids are not dangerous, prohibited items.
Carry-on liquids that must be in containers of 3.4 ounces or less include mouthwash, shampoo, liquid soap, creams and gels. Both over-the-counter and prescription medications are exempt from the size limit. Liquid items for children that are exempt include breast milk, formula, juice, baby food and teething supplies. Any exempted liquid items may be subject to extra security screening. After passengers pass the security checkpoints and are within the airport, they can buy larger liquid items, such as bottled water, at duty free shops and carry them aboard the airplane.
There is no limit to the amount of liquids that passengers can carry in their checked-in luggage. However, they cannot carry anything on the TSA list of banned items. This includes gel paints, spray paints, tear gas, gasoline and other types of fuel. It also includes chlorine, bleach and batteries with spillable internal liquids.