As of February 2026, talcum powder is allowed in both carry-on and checked luggage, but it is subject to the "Powder-like Substances" rule. If you are carrying more than 12 ounces (350 ml)—roughly the size of a soda can—in your carry-on, you must remove it from your bag at the security checkpoint for separate X-ray screening. Security officers may need to open the container for additional testing or "swabbing" for explosives. To avoid delays, the TSA and international agencies like the UK’s Department for Transport strongly encourage passengers to pack large quantities of powder in their checked bags. Note that "medically necessary" powders or baby formula are exempt from the 12-ounce limit but must still be declared. If the powder cannot be cleared by the security agent's testing equipment, it will not be allowed into the cabin.