🃏 Playing cards

Nothing will happen — playing cards are permitted in carry-on and checked baggage everywhere with no restrictions. Screeners will not stop you, confiscate them, or ask you to check them. They pass through the X-ray without any issues.

The cards themselves are not restricted by aviation security anywhere, but some countries have laws against gambling or gambling paraphernalia. If you are traveling to a destination with strict anti-gambling laws, such as certain Gulf states, it is worth checking local customs rules even though the cards will clear every airport security checkpoint without a problem.

Playing cards are one of the most straightforward items you can carry — no screener authority anywhere treats them as a concern. There is no record of them being confiscated or delayed at checkpoints. Pack them anywhere in your bag.

Multiple decks are fine from a security standpoint regardless of how many you bring. The only practical consideration is weight — a large number of card decks adds up quickly and could contribute to exceeding your airline's baggage weight limit. Otherwise, pack them wherever is convenient.