TSA liquid rules allow larger containers at some UK airports
The Transportation Security Administration and international aviation authorities have long enforced strict limits on carry-on liquids, though recent changes in the United Kingdom permit passengers to bring up to 2 liters of liquid through certain terminals.

Standard rules for carry-ons
Travelers must pack liquids, aerosols, and gels in containers no larger than 3.4 ounces for carry-on bags. All such containers must fit inside a single, clear, quart-sized bag when going through security checkpoints. This regulation applies to items like shampoo, sunscreen, toothpaste, and peanut butter.
New allowances in the UK
Some airports in the United Kingdom, including London Heathrow, now allow passengers to carry liquids of up to 2 liters. These larger containers must still be packed in checked luggage if they exceed the standard limit. Advanced CT scanners at these locations enable security staff to identify hazardous substances without confiscating full-sized items.
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