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It's not 3 bottles, it's 3.4 oz or 100 ml.

isn't it whatever fits in a quart-sized ziploc? i presume that's where the other poster estimated "only 3 bottles."

3-1-1 is an awful mnemonic, but it's basically: 3.4 oz containers in 1 1-quart ziplock bag.

I guess the comms people got their hands on it before they deployed the original mnemonic: 3.4-1-1