Alcohol can travel on a plane when its strength, quantity, packaging and baggage location meet the applicable rules. A five-litre aviation limit is not a five-litre duty-free allowance. First read the bottle's alcohol by volume, then check security screening, airline carriage and destination customs separately.
This guide focuses on packing personal purchases, using official US and UK guidance checked on 26 September 2026. It does not establish commercial import permission or a worldwide drinking-age rule.
Sort bottles by ABV before choosing a bag
The UK CAA distinguishes drinks at or below 24% ABV from those above 24% through 70%. The former are not restricted by this dangerous-goods alcohol quantity rule; the latter require retail packaging and have a five-litre total per person. Baggage and customs constraints still apply. CAA alcohol guidance
For US carriage, the FAA specifies unopened retail packaging for the over-24%-through-70% group, with no package over five litres and no more than five litres per passenger. British Airways expressly prohibits drinks above 70% in either cabin or checked baggage. FAA alcoholic beverages, British Airways alcohol restrictions
Use ABV rather than a marketing description such as “strong,” “reserve” or “liqueur.” Exactly 24% falls on the lower-strength side of the CAA rule; exactly 70% is within the upper band. Ask the carrier about an unusual or unlabelled product before buying it for a flight.
Calculate beverage volume, not pure alcohol
Consider six unopened 750 mL bottles at 40% ABV. Their drink volume is 6 × 750 = 4,500 mL, or 4.5 litres. A seventh makes 5,250 mL, or 5.25 litres.
Do not multiply the 4.5 litres by 40% and compare the resulting 1.8 litres with a five-litre beverage limit. ABV selects the strength category; the full liquid volume is what you total within it.
For a mixed shopping list, give each product its own line: bottle size, number, ABV and subtotal. A 700 mL spirit bottle, a 1 litre spirit bottle and two 500 mL liqueurs total 2.7 litres. Keep a wine entry separate when checking a rule that distinguishes strength bands.
These calculations organise a purchase; they do not decide customs eligibility. Use the Great Britain alcohol guide or Australia bottle-count guide for the separate destination worksheet.
Cabin screening is a container-size decision
The FAA notes the TSA checkpoint limit of 100 mL containers. UK guidance says most airports use that size limit, while some permit containers up to two litres; check every departure and transfer airport. A partly full oversized bottle does not qualify at a checkpoint applying the 100 mL limit. FAA screening note, GOV.UK liquids guidance
Suppose your 700 mL bottle contains only 70 mL. At a 100 mL-container checkpoint, the remaining liquid volume does not make the bottle acceptable. Conversely, choosing small containers does not erase the airline's packaging requirements or increase a customs allowance.
Do not decant retail spirits into unlabelled travel bottles as a workaround. That creates a new packaging and identification problem instead of solving the complete journey.
Airport purchases still need a transfer plan
UK guidance permits qualifying airport or onboard liquid purchases through security when sealed in a security bag with the receipt sealed inside and visible. Keep the bag closed until the final destination; screening staff may need to inspect it. GOV.UK airport-purchase conditions
Before paying, identify the next checkpoint and whether you can access checked luggage before reaching it. A second airport may apply a different process. Use the duty-free connections guide for that decision rather than treating a sealed shopping bag as universal clearance.
Pack checked bottles for handling and inspection
Once carriage is established, choose cushioning that separates glass bottles from each other and from hard objects. Put a leak-containing layer around each bottle without hiding its label permanently. Leave closures intact and avoid a packing arrangement that requires cutting through the entire suitcase contents for inspection.
Weigh the completed bag. Liquid volume alone does not tell you the baggage weight because glass and protective packaging add mass. For example, if your measured bag weighs 21.4 kg and you add a bottle-and-sleeve assembly weighing 1.2 kg, the result is 22.6 kg. Compare that with your actual purchased baggage allowance, not an assumed standard allowance.
Permission to carry is not permission to pour
FAA rules prohibit drinking alcohol onboard unless the air carrier serves it. A bottle bought after security is not an exception. FAA onboard consumption rule
Finish with two separate records: your baggage plan and your customs inventory. Include airport purchases in the latter, check the destination's age and personal-use conditions, and follow its declaration procedure if required. Keep receipts where you can reach them without opening packed glassware.