Herbal cannabis with an estimated value of €35,950 has been seized at the Dublin Mail Centre.
It was discovered on Tuesday as a result of routine operations.
Revenue officers seized 1.8kgs of the illegal drugs, which were found in 13 separate parcels.
They had all come from the United States.
The parcels were declared as items such as 'model car', 'sweets', 'chocolate' and 'Pez dispensers'.
All of the packages were destined for addresses in Dublin.
Revenue say investigations are ongoing.
Between January 1st and February 29th, officers in mail centres nationwide have detected and detained drugs with an estimated value of €1.2m.