Duty-free and cabin baggage: plan the purchase and connection

Check the entire itinerary before buying. Duty-free is a sales arrangement, not a universal security exemption or a guarantee of a free extra bag.

At the shop and before boarding

Tell the retailer your transfer airports and ask about a suitable sealed security bag with the receipt inside. Keep the item and receipt together; do not open the bag yourself or replace it with an ordinary zip bag. A retailer’s assurance does not decide another airport’s screening result.

Allow room and weight within the operating airline’s allowance, unless its own policy expressly grants an additional shopping bag. Solid purchases do not use the liquid exception; they can still have product, baggage or import restrictions. Aerosols, batteries and alcohol have additional rules even when sold airside.

Buying after the last security checkpoint can reduce the number of later screenings, but check the remaining route, boarding conditions and destination customs first. If a bottle may need to go in checked baggage, establish whether you can actually access and recheck that bag. Do not assume you can add it after the bag has already been accepted.

Cabin screening: check the container

For EU departures, ordinary cabin liquids use containers of no more than 100 ml inside a transparent bag of up to 1 litre. TSA screening in the US also limits ordinary containers to 100 ml, but uses a quart-sized bag. A partly empty 750 ml bottle is still a 750 ml container. Small bottles must also meet the alcohol-strength rules.

Duty-free and another security check

For EU screening, duty-free liquids and the receipt must remain sealed in the security bag provided at purchase. If an officer opens it, mention any onward connection so it can be resealed in a new security bag. Do not open it yourself before the final destination.

For an international arrival connecting within the US, TSA allows duty-free liquids over 100 ml when bought internationally, retailer-sealed in a transparent tamper-evident bag, and accompanied by the original receipt from a purchase within 48 hours. They must still pass screening. A shopping bag or an old reused security bag is insufficient.

Customs and the airline are separate checks

Check destination customs before buying: tax-free sale does not grant tax-free import, remove age restrictions or override import bans. EU guidance for entry from outside the EU distinguishes still wine and beer from the alternative spirits or fortified/sparkling-wine allowance. Travel within the EU for personal use has a different framework.

The airline sets baggage size, weight and item count; a duty-free purchase is not automatically an extra free bag. On flights covered by FAA rules, passengers may drink alcohol only when served by the airline. Crew are not obliged to serve a passenger’s own bottle.

Related guides

• Alcohol in cabin baggage: security, airline and customs rules
• Flying with wine: choose a bag and protect the bottles
• Can you bring alcohol on a plane? A quick rule check
• Duty-free liquids in transit: keep the seal and prove the purchase
• Does a duty-free bag count as cabin baggage? Check the airline
• Check your packed bag

Official sources

FAA PackSafe · FAA PackSafe PDF · TSA · Your Europe — Cabin screening: check the container · Your Europe — Customs and the airline are separate checks.