Workers at Canada Post went on strike Friday in a move that is expected to create delays and other disruptions to mail and parcel delivery — just as the Crown corporation prepares for what’s typically its busiest period.

The Canadian Union of Postal Workers says it came to the decision after “a year of bargaining with little progress.” Meanwhile, Canada Post says it’s “disappointed” with the decision, which will “have a significant and immediate impact on millions of Canadians, small businesses and charities who count on Canada Post during the busy holiday season.”