Belfast International Airport is providing passengers with transparent bags following the relaxation of rules over liquids in hand luggage.
The airport will give out re-sealable bags for a few days
Passengers are allowed to carry drinks and toiletries - limited to a few small bottles - through airport security for the first time since August.
The Belfast airport said it would only provide bags for the next few days.
It said there could be some delays but advised passengers to come prepared in order to speed up the process.
The government-imposed curbs on liquids began after police said they had foiled an alleged terror plot to bring down as many as 10 planes travelling from the UK to the US.
People are limited to 100ml per container and no more containers than would fit in a one-litre plastic bag.
100ml containers in one-litre re-sealable clear plastic bag (20cm x 20cm)
Verified prescription medicines essential for flight
Baby milk and liquid baby food
The restrictions are also being brought in across the EU and airports say the introduction may mean possible delays.
The new rules require that liquid containers holding items such as toothpaste, cosmetics and shaving foam be carried in a clear plastic, re-sealable bag that does not exceed 20cm x 20cm (8in x 8in).
At the airport security search, the plastic bag will need to be removed from the hand luggage and X-rayed separately.
Airport officials say staff have been undergoing training and are on duty to advise people in check-in queues about the latest changes.
The bag containing the liquids will be X-rayed separately
The new rules also mean essential medicines and baby food are allowed in amounts larger than 100ml.
Large musical instruments are also permitted, in addition to one item of cabin baggage, the Department for Transport has said.
Restrictions on hand luggage sizes brought in at UK airports in August were relaxed the following month.
Liquid items, other than small quantities of essential medicines and baby food, have not been allowed through security at UK airports since August.
But passengers travelling from some European countries have not always faced the same restrictions.
The new regulations on liquids are now standardised across the EU and also apply to airports in Switzerland, Norway and Iceland.