Whether you're buying some in duty-free or hoping to pack some bottles in your suitcase to save money on the other side, there are strict rules on what booze you can and can't bring on planes.

Brits flying with the likes of , , , and should be aware of the rules before heading to the airport, or you could risk your drinks being confiscated.

That's because there's a little-known rule around the exact alcohol you can take on a flight - and it can catch some Brits out. It all comes down to the drink's Alcohol By Volume (ABV), which measures how much alcohol is in a specific volume of a beverage. Airlines including easyJet and Ryanair have a ban on any alcohol with an ABV of over 70%.

If you bring alcohol on a flight, check the ABV as usually, airlines have a rule that if your drink's ABV is over 24% then it must be sealed and packed in either an airport shopping bag or your cabin bag. This applies to alcohol that's bought in duty-free too. Alcohol drinks with an ABV of under 24% are not usually subject to restrictions.

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Then of course, if you're planning to bring booze before you get to the gate, you'll need to make sure your drinks also adhere to the 100ml liquid restrictions at airport security.

As for drinking on an aircraft? The law is pretty clear, stating that "a person must not enter any aircraft when drunk, or be drunk in any aircraft". Those who break the rules could risk being denied boarding or, if they're disruptive on the flight, could face fines or further action when they land.

Airlines such as Jet2 have a ban on you drinking your own booze - you'll need to buy it from the drinks trolley and have it be poured by a cabin crew member. These rules can differ, so to make life a little easier we've rounded up individual airline rules around booze below.

easyJet

The airline's website states: "You can bring alcohol bought in the airside departure lounge into the cabin, as long as it’s unopened. Alcohol must be lower than 70% abv, and packed either in an airport shopping bag or in your cabin bag. It’s strictly forbidden to drink any alcohol that has not been purchased on board the aircraft and those found consuming their own alcohol may face prosecution."

Ryanair

The airline allows you to bring your duty-free bag with duty-free items into the cabin, alongside your cabin bags. (But be warned they do check them so it's not necessarily an extra bag you can use for all of your belongings as a way to get around cabin rules). Meanwhile, "alcohol with an ABV of more than 70% (140% proof) is not permitted" on Ryanair flights.

TUI

The airline's website allows "alcoholic beverages, containing more than 24% but not more than 70% alcohol by volume, when in retail packagings in receptacles not exceeding 5 L, with a maximum total net quantity per person of 5 L for such beverages".

Alcoholic beverages with more than 70% alcohol by volume are not permitted, but those under 24% abv are not subject to restrictions (unless you're taking them through airport security in which case the 100ml rule applies).

Jet2

Jet2's website is clear: "You may not bring on board alcohol for the purposes of consumption whilst on the aircraft. For safety reasons we restrict the consumption of alcohol on board. Only alcoholic drinks purchased on board may be consumed during the flight. It is an offence to be drunk on any aircraft. Jet2.com reserves the right to serve alcoholic drinks to customers at our absolute discretion."

Alcohol with an abv over 70% will not be allowed in either your checked or hand luggage.

British Airways

"There's no limit on the number of alcoholic beverages you can travel with as long as their alcohol volume is below 24%," a statement on the airline's website reads. "You can bring up to five litres of alcohol with an alcohol volume between 24% and 70%. This can travel in your cabin bag if you purchased it in the airport duty-free shop, or you can pack in your checked baggage.

"Drinks above 70% alcohol volume are not permitted on board our aircraft in either checked baggage or hand baggage. Please see the hand baggage requirements section above for information about taking liquids in your hand baggage through the security check areas."