In 2026, airport liquid rules have undergone a massive shift, particularly in the UK and parts of Europe. Major hubs like London Heathrow, Birmingham, and Edinburgh have officially scrapped the "100ml rule" after installing next-generation CT scanners. At these airports, you can now carry containers of up to 2 liters of liquids, gels, and pastes in your hand luggage, and you no longer need to place them in a clear plastic bag. Furthermore, laptops and electronics can stay inside your bag. However, this is not yet a global standard; in most U.S. airports (TSA) and many European holiday spots, the 100ml (3.4 oz) limit remains strictly enforced. For 2026 travelers, the high-value advice is to "pack for the return": even if your departure airport allows 2-liter bottles, your return airport might not, potentially forcing you to throw away expensive toiletries before your flight home.