Revenue officers, along with the assistance of detector dog Robbie, discovered 25kgs of herbal cannabis in Dublin Port yesterday.
Officers seized the drugs which have an estimated street value of €500,000 during routine operations.
A shipment which had arrived from Almeria, Spain was stopped and searched.
In a separate incident at Portlaoise Mail Centre yesterday, 3.4kgs of herbal cannabis was seized.
As a result of routine profiling the drugs were discovered concealed in two separate parcels labelled as 'yoga cushions' and 'herbal tea'.
The drugs with an estimated street value of €68,000 were destined for addresses in Dublin and Tipperary.
Investigation s are ongoing with a view to prosecution.
Last week in a series of operations in Dublin Airport, Revenue officers made a number of seizures including: