Liquids in hand luggage: the 100ml rule and where it has changed

The rules on carrying liquids in hand luggage are what most often hold passengers up at security. At most UK airports they are strict, but at some airports with new equipment they have been relaxed. So the key rule is simple: before you fly, check the requirements of your own departure and transfer airports.

How much liquid can you take?

At most airports, liquids in hand luggage are allowed only in containers of no more than 100ml each — even if a bottle is only part full. But some airports that have installed new scanners allow containers of up to 2 litres. There is currently no single nationwide rule, so you need to go by your specific airport.

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Do you need a transparent bag?

Where the airport requires it, all liquid containers must go into a single transparent resealable bag holding no more than 1 litre and measuring about 20cm by 20cm. The bag must seal, the contents must fit comfortably inside, and it must not be tied at the top. Each person is allowed one such bag, shown separately at security.

What counts as a liquid?

Security treats more than just drinks as liquids. The rule covers: all drinks, including water; liquid or semi-liquid foods such as soup, jam, honey and syrups; cosmetics and toiletries such as creams, lotions, oils, perfumes, mascara and lip gloss; sprays such as shaving foam, hairspray and spray deodorants; pastes, including toothpaste; gels for hair and shower; and contact lens solution. Frozen liquids are usually not allowed in hand luggage.

What are the exemptions?

At all UK airports you may bring containers of up to 2 litres through security if they are: medicines for essential medical purposes, food for special dietary requirements, or baby food and baby milk. A separate rule applies to airside purchases: liquids bought at the airport or on board (such as duty free) can be carried if sealed in a security bag with a visible receipt inside — do not open it until you reach your final destination. A practical tip: even if your airport allows larger containers, your destination or transfer airport may still use the old 100ml rule, so it is safer to plan around the strictest airport on your route. Take liquids out of your bag in advance and keep them to hand to clear security faster. The exact requirements are always published on gov.uk and on your airport's website.