Most airport security regimes limit liquids in cabin baggage to individual containers of 100 ml or less, with all containers carried together in a single transparent, resealable bag of roughly one liter capacity. This is a widely adopted international standard, though not applied identically everywhere.
The container size is what’s checked, not how full it is — a 200 ml bottle with only 50 ml remaining is generally still treated as a 200 ml container and would need to be decanted into a compliant size to pass through some checkpoints.
Some regions have begun easing this limit at checkpoints with newer CT-scanning technology, allowing larger containers or removing the separate-bag requirement, while most airports have not yet made this change. Confirm the current rule for the specific departure airport rather than assuming the traditional 100 ml limit no longer applies everywhere.
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