Can I carry duty-free alcohol in my carry-on bag?

Yes, if purchased airside (after security) in a sealed STEB (Security Tamper-Evident Bag) with proof-of-purchase receipt. The 100 ml liquid rule does not apply to sealed STEB purchases. However, STEB bags can be confiscated at transfer security checkpoints in some countries including Australia, Japan, and some Gulf states.

A STEB (Security Tamper-Evident Bag) is the sealed clear bag duty-free shops use to package liquid purchases — alcohol, perfume, or other liquids over 100 ml — so they can be carried through subsequent security checks. The bag has a receipt inside and a tamper-evident seal. It must remain sealed to be valid.

Will my STEB bag be confiscated on a connecting flight?

It depends on your transfer country. Australia, Japan, and some Gulf states confiscate STEB bags at transfer security. EU Schengen-to-Schengen connections and intra-UK flights generally allow them. US domestic connections from international arrivals follow a 3-hour rule. Always check before buying.

What is the difference between duty-free and tax-free?

Duty-free shops airside at airports are exempt from excise duty and VAT, giving you lower prices. Tax-free refund (also called VAT refund or Tax Free Shopping) is different: you buy goods in a regular shop at full price, then claim back the VAT at the airport when you depart. Both can save money but work differently.

How much alcohol can I bring home duty-free?

UK customs allows 2 litres of wine plus 1 litre of spirits. EU allows 4 litres of wine plus 1 litre of spirits. The US allows 1 litre of alcohol within the $800 personal duty-free exemption. Amounts above these limits are subject to customs duty.

Duty-Free and Carry-On Rules: What You Can Actually Bring

Duty-free shopping is one of travel's genuine perks — but the rules around carrying those purchases through security and across borders trip up experienced travellers. Here is how it actually works.

The Core Rule: Airside Purchases Are Exempt from 100 ml

The 100 ml liquid rule applies to items brought from outside the airport (i.e., packed at home). Liquids purchased airside — inside the security zone, after you have passed through the checkpoint — are exempt, provided they are packaged correctly.

The mechanism is the STEB bag (Security Tamper-Evident Bag): the sealed clear bag your duty-free shop puts your purchase in, along with your receipt. As long as the seal is unbroken and the receipt visible, the item is treated as a screened purchase and permitted through subsequent security checks.

This is why you can carry a bottle of whisky onto a plane when you cannot carry a 200 ml bottle of shampoo.

The Problem: Transfer Connections

The STEB exemption breaks down at transit security checkpoints. When you connect through certain countries, your STEB bag goes through security again — and the officer at that checkpoint may not recognise it as valid.

Transfer location	STEB bags accepted?
EU Schengen to Schengen	Yes — generally accepted
Intra-UK connections	Yes
US domestic connection (from international)	Yes if purchase was made within 3 hours of the first leg
Australia (any transfer)	No — confiscated
Japan (any transfer)	No — confiscated
UAE and some Gulf states	Inconsistent — verify before buying

If you have a transfer, check before you buy. A bottle of wine you cannot bring home is an expensive donation to airport security.

What You Can Buy Duty-Free and Carry

Category	STEB required for carry-on?	Notes
Spirits (whisky, gin, rum)	Yes	Sealed STEB only
Wine and champagne	Yes	Sealed STEB only
Perfume (sealed)	Yes	Once opened, counts as a liquid under 100 ml rule
Perfume (opened)	No — must be 100 ml or less	Standard liquid rules apply
Chocolate, food	No	Not a liquid
Cigarettes, tobacco	No	Not a liquid
Electronics	No	Not a liquid

Duty-Free vs Tax-Free: Two Different Things

These are often confused:

Duty-free shops (airside, in the airport) sell at prices without excise duty and VAT built in. You pay less at point of sale. No paperwork needed.

Tax-free refund (VAT refund) works differently: you buy goods in regular shops at full price, fill in a form at the shop, then claim the VAT back at the airport departure desk or a refund kiosk. The refund is typically 10–20% of the purchase price, minus a processing fee.

Both are legitimate savings — just different systems.

Customs Limits on Return

Duty-free savings only apply up to your home country's personal customs allowance. Above the limit, you owe customs duty.

Destination	Wine allowance	Spirits allowance	General goods exemption
United Kingdom	2 litres still wine	1 litre spirits (over 22% ABV)	£390
European Union	4 litres still wine	1 litre spirits (over 22% ABV)	€430 (air/sea)
United States	—	1 litre alcohol	$800 per person
Canada	1.5 litres wine	1.14 litres spirits	CAD 800 (after 48 hrs abroad)

These are per-person limits. Two adults travelling together each have their own allowance — you cannot pool them into one declaration unless your country explicitly permits it.

Practical Tips

Buy on the outbound leg if you are not connecting. If your outbound flight goes directly to your destination without a transfer, you avoid the STEB problem entirely. Buy at your departure airport and the bottles sit sealed in your bag until you land.

Buy on the inbound (return) leg when possible. You clear home customs once with your purchases — no transfer risk, and you are heading straight home rather than starting a trip with fragile bottles.

Keep your receipt visible inside the STEB. Security officers sometimes ask to see it. Do not discard it.

Opened perfume is subject to the 100 ml rule. The STEB exemption applies only to factory-sealed goods. If you open the perfume at the airport to try it, it becomes a standard liquid for all subsequent security checks.