Seized drugs with an estimated value of close to €370,000 were destined for addresses in counties including Cavan.
As part of routine operations yesterday, revenue officers found 18 kilos of herbal cannabis at two premises in Dublin.
Small quantities of butane honey oil, cannabis resin, MDMA, ecstasy tablets, and cocaine were also seized.
The drugs were discovered, with the help of detector dogs Bailey and Sam, and were concealed in parcels which originated in North America, Europe and the United Kingdom, and the parcels were labelled as 'tuxedos', 'tea', 'board games', 'jeans', 'car organisers' and 'pet blanket'.
The drugs were destined for addresses in counties including Cavan, Dublin, Meath, Louth, Leitrim, and Tipperary.