An Post says Christmas was its busiest ever period for delivering parcels.
It delivered more than 1.7 million packages in the five week lead-up to Christmas.
It says parcel volumes from Amazon were up over 30% on the previous year.
Others featuring heavily included Irish brands like Arnotts, Brown Thomas and Smyths Toys.
General mail volumes were down by over 6% but the company says this is in line with global trends.