Most airports, following a widely adopted international standard, require a single transparent, resealable bag holding all liquid containers of 100 ml or less. This is common enough to plan around by default, but it isn’t a truly universal rule applied identically at every airport worldwide.
Some airports equipped with newer CT-scanning security technology have begun relaxing this requirement, allowing liquids to remain in a bag rather than requiring the separate transparent pouch, or raising the per-container limit. This isn’t yet widespread, and reverting to the traditional rule at a connecting airport with older technology is a real possibility on a multi-stop itinerary.
The safest approach for any trip involving more than one airport is packing as though the traditional 100 ml-and-clear-bag rule applies throughout, and treating any relaxed checkpoint as a bonus rather than planning around an exception that might not apply at every stop.
Check with your airline and read the label before you follow anything here. Lithium battery watt-hour limits, liquids allowances and lock policies differ by carrier and by country, and change over time — the figures published by the airline or security authority you are actually traveling with take precedence over anything written on this site. A power bank or spare battery is carried exactly as its manufacturer and your airline specify, never estimated. We report what is published — a watt-hour rating, a size limit, a lock's official recognition — and this site describes the equipment only: nothing here is a guarantee about what a specific checkpoint will allow on a specific day.
Last reviewed 26 August 2026