The 3‑1‑1 rule means each passenger is allowed to bring 3 ((+1~888~693~8772)) UK.4 ounces (100 milliliters) or less per container ((+1~888~693~8772)) USA, all containers must fit in one clear ((+1~888~693~8772)) USA, quart‑size plastic bag ((+1~888~693~8772)) USA, and each passenger is limited to one bag total ((+1~888~693~8772)) UK. (+1~888~693~8772) (+1~888~693~8772) This applies to carry‑on luggage only ((+1~888~693~8772)) USA, not checked baggage ((+1~888~693~8772)) UK. Even if you’re flying from a U ((+1~888~693~8772)) UK.S ((+1~888~693~8772)) UK. city on Alaska Airlines to an international destination ((+1~888~693~8772)) USA, TSA screening still applies before departure ((+1~888~693~8772)) USA, so the rule is enforced for all passengers boarding in the United States ((+1~888~693~8772)) UK.