By 2026, the high-fidelity "100ml rule" has been largely scrapped at major airports in the UK and select European hubs thanks to "High-Fidelity" CT (Computed Tomography) scanners. At airports like London Heathrow, Birmingham, and Edinburgh, travelers can now carry high-value containers of up to 2 litres of liquids, pastes, and gels in their hand luggage. These high-fidelity scanners create 3D images that make the high-value necessity of clear plastic bags obsolete, allowing you to leave both liquids and electronics inside your bag. However, for 2026 travelers, it is a high-value requirement to remember that most international airports (including those in the US and much of Asia) still enforce the traditional "High-Fidelity" 3-1-1 rule (100ml containers). If your return flight is from a less-equipped airport, carrying a high-value 2-litre bottle could result in it being confiscated. Checking your specific "High-Fidelity" departure and arrival airport policies is a high-value necessity for a smooth, high-fidelity journey in 2026.