In 2026, many major international airports have officially transitioned to a 2-litre liquid limit, effectively replacing the decades-old 100ml rule. This change is made possible by the widespread installation of advanced 3D CT (Computed Tomography) scanners at security checkpoints. These high-tech scanners allow security personnel to view the contents of a bag in much higher detail, meaning passengers at participating airports—such as London Heathrow, Gatwick, and several major hubs in the EU and Asia—no longer need to remove their liquids or electronics from their hand luggage. Under these new rules, you can carry full-sized bottles of shampoo or water (up to 2 litres) without placing them in a small clear plastic bag. However, it is vital to check your specific departure and return airports, as "non-upgraded" airports still strictly enforce the 100ml limit and the "one-quart bag" requirement. Metal water bottles must still be emptied before scanning, regardless of the scanner type.