Quick rules for flying with liquids in carry-on and checked baggage. Verdicts and conditions across the major aviation regions below.
3-1-1 rule: containers of 3.4 oz (100 ml) or less, all fitting in one clear quart-sized bag, one bag per passenger. Larger containers must go in checked luggage. Exceptions: medicine, baby formula, breast milk.
100 ml rule: liquids in containers ≤100 ml, all in one transparent 1-litre resealable bag. Some EU airports with new CT scanners are easing this — check your departure airport.
100 ml limit per container, all in one 1-litre clear bag. UK airports are transitioning to 2-litre allowances with new scanners — check your specific airport for current rules.
100 ml rule across LATAM (ICAO baseline). All containers ≤ 100 ml in one transparent 1 L bag, one bag per passenger. Duty-free in sealed STEB bags accepted on connections. Mexico, Brazil, Argentina, Chile and Colombia all enforce uniformly.
100 ml rule across the region (ICAO Annex 17). All containers ≤ 100 ml in one transparent 1 L resealable bag, one bag per passenger. Some major hubs (Singapore Changi, Hong Kong HKG, Tokyo Narita / Haneda, Seoul Incheon) are rolling out CT scanners that ease the rule on departure — destination airport still applies on return. Duty-free in sealed STEB bags accepted on connections.
100 ml rule applies (Australia CASA + NZ CAA, ICAO baseline). One transparent 1 L bag, containers ≤ 100 ml. Sydney, Melbourne, Auckland, Brisbane progressively upgrading to CT scanners (2025–2026) — until then, standard rule. Duty-free in STEB bags allowed on connections.