They were discovered in a number of packets which originated in Spain, UK and the USA.
Drugs worth almost €39,000 have been seized at Athlone Mail Centre.
Revenue officers discovered the 1.9 kilograms of herbal cannabis, mitragynine and synthetic cannabinoids during routine checks today.
They were recovered in a number of packets declared as clothing, orginiating in Spain, UK and the US, and destined for addresses in Dublin, Mayo, Kildare and Cork.
Separately, drugs destined for addresses in Laois were seized by Revenue at the Dublin Parcel Hub.
500 grams of herbal cannabis and over 125,600 cigarettes in parcels orginating in the US were discovered with the assistance of detector dog Sam.
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