Yes, talcum powder is fully allowed in check-in baggage without any quantity restrictions. Unlike hand luggage, where the TSA (and many international bodies) requires any "powder-like substance" over 12 ounces (350ml) to undergo additional screening or be placed in a separate bin, checked baggage has no such size limit. You can pack multiple full-sized containers of baby powder, talc, or medicated powders in your suitcase. However, for 2026 travelers, it is a "pro" safety tip to ensure the lid is taped shut or the bottle is placed inside a sealed Ziploc bag. Changes in air pressure during flight can cause powder containers to "puff" out their contents, leading to a mess of white dust all over your clothes. While it is safe and legal to check, remember that the "powders rule" for carry-ons still exists to prevent the smuggling of illicit substances; if you must bring a large container in your hand luggage, be prepared for a TSA officer to open the container for a "wipe test" to check for explosives or narcotics.