TSA officers may need to test the liquids for explosives or concealed prohibited items. Although not required, to expedite the screening process, it is recommended that formula and breast milk be transported in clear, translucent bottles and not plastic bags or pouches.

When packing formula milk for air travel in 2026, it is best to use pre-portioned dispensers for powder and bring at least a 24-hour extra supply in case of delays. Under international security rules (like TSA or CATSA), baby formula and breast milk are considered "medically necessary liquids" and are exempt from the 3.4oz (100ml) limit. You should pack these items in a clear, easy-to-access bag and declare them to security officers for separate screening. If using liquid formula, keep it in its original factory-sealed containers. For powdered formula, TSA recommends avoiding metal-lined containers as they can trigger alarms during X-ray screening. You are also allowed to bring gel ice packs to keep milk cool, provided they are presented with the baby's food. Carrying a vacuum-insulated flask with pre-boiled hot water is also permitted for mixing formula on the plane, though you should inform the agent that it is for infant feeding.