To safeguard the safety of passengers and/or aircraft, international rules apply on what you can or cannot carry on board an aircraft. Under these rules, e.g. all pointed or blunt items that may be used as an attack weapon are strictly forbidden in the aircraft cabin. So as to also protect you against the threat of liquid and plastic explosives, the European Union has adopted additional security rules that restrict the amount of liquids and gels that you can take through security checkpoints.
Liquids and gels you wish to take in your hand baggage have to be packed in individual containers of max. 100ml. These containers have to be packed together in a single transparent re-sealable plastic bag with a capacity of no more than 1 litre per passenger.