Europe is currently in a transitional phase regarding liquid restrictions, making it both strict and lenient depending on the airport. As of 2026, many major hubs like London Heathrow, Amsterdam Schiphol, and London City have installed advanced C3-grade CT scanners that allow passengers to keep liquids (and electronics) in their bags and carry bottles up to 2 liters. However, the European Commission recently reinstated a temporary 100ml limit at many airports that had previously lifted it, due to technical consistency issues with some scanners. Therefore, the "safest" 2026 rule remains the traditional 100ml (3.4 oz) limit in a clear, quart-sized bag unless the specific airport’s signage explicitly states otherwise. Airports in smaller cities or less-developed regions still strictly enforce the old rules. If you are traveling across multiple European countries, you should be prepared for the strictest interpretation of the law to avoid having your expensive toiletries confiscated during a security transfer.