Most airport security regimes, following a widely adopted international standard, require cabin liquids in individual containers of 100 ml or less, all carried together in a single transparent, resealable bag of roughly one liter. A 100 ml bottle carried in an opaque or oversized bag can still be flagged at the checkpoint, even though the bottle itself complies.
Decant larger bottles into reusable travel-sized containers rather than assuming a partially-used larger bottle counts by its remaining contents — screening generally goes by the container’s printed size, not how full it is.
This rule varies by country and changes over time — some regions have begun easing the 100 ml limit at security checkpoints equipped with newer scanning technology, while most have not. Confirm the current rule for the specific airport and route before relying on any figure, including this one, as a guarantee.
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