How Big Can Shampoo Bottles Be On A Plane? | 3.4 Oz Rule
Carry-on shampoo must be in a 3.4 oz (100 mL) container inside one quart-size bag; larger bottles belong in checked luggage. You’re standing over your toiletry bag, holding a full-size shampoo bottle, doing that familiar math: “Will this get tossed at security?” Good news: the rule is simple once you know what security actually checks. […]
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