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1.5 litres of spirits above 20% ABV, 2 litres at or below, or 3 litres of beer, per adult. The allowance is banded by strength — which is why most summaries get it wrong.

The CPAP machine is never the problem — the battery is. Over 160Wh is banned outright in Vietnam, 100–160Wh must be declared, maximum two, hand luggage only. How to check your rating.

Fish sauce travels in the checked bag, not hand luggage — it is a liquid, and container size is what counts. Buy it sealed rather than decanted, and wrap it well.

An overstay is caught at departure immigration, not at your next visa application. The officer reads the entry stamp, sees the date has passed, and settles the penalty at the counter while your flight boards.

Two million VND at one registered shop on one day, invoice within 60 days, goods still sealed. You get 85% of the VAT back — and only if customs sees the goods before you check your bags.

Up to 15 million VND or US$5,000 you simply walk out. Above either figure you need a customs declaration and a certificate from a licensed bank — which cannot be obtained at the airport.

$45 per person covers all three departure queues at any Vietnamese international airport — $66 if booked one lane at a time. The $25 two-lane bundle, the $120 VIP tier, and why departure costs more than arrival.

Leaving Vietnam means three separate queues — check-in, immigration, security — and one fast track lane covers one of them. Why booking a single lane leaves you queueing twice more.