In 2026, the global status of the 100ml liquid rule is in a state of transition. At most airports worldwide, including the majority of those in the United States and Europe, the 100ml limit remains strictly enforced, requiring all liquids to fit in a single, quart-sized clear plastic bag. However, a significant shift has occurred at several major UK and international hubs. Airports like Heathrow, Gatwick, Edinburgh, and Birmingham have now fully implemented advanced 3D CT scanners. These scanners allow passengers to keep liquids and electronics inside their bags, and more importantly, they have increased the liquid limit to 2 litres per container. While this is a massive improvement for travelers, the "pro-tip" for 2026 is to remain cautious: even if you fly out of an upgraded airport with a large bottle of shampoo, the airport on your return journey may still follow the old 100ml rule, potentially resulting in your items being confiscated during the trip home.