1. Key points

  • One quart-size bag per passenger.
  • Larger liquids go in checked bags.
  • Exceptions include medically necessary liquids, baby formula and breast milk, in reasonable quantities (tell the officer).
  • TSA's 'What Can I Bring?' tool checks specific items.

2. Duty-free

Duty-free liquids in secure, tamper-evident bags may be allowed under conditions; check TSA guidance for connecting flights.