"It's the corporation that's stalling at this point, so it's really all in their hands." said Keith Bradford, President of Canadian Union of Postal Workers Local 576.
About 6,000 workers who walked off the job in Montreal have returned to work.
"Once processed, these items have to be delivered without overburdening our delivery employees". Those three facilities process a million parcels a day.
To further press its contract demands, CUPW would institute a ban on overtime for both of its major bargaining units, effective 12:10 a.m. today, the union told the Canadian Press.
"We're doing our best to maintain service, but it's creating uncertainty and stress for our employees, as well as customers", Hamilton said.
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CUPW says the Montreal walkout ended Tuesday night, but another 15 communities across the country were still taking part in the 24-hour strikes.
Workers are also out in Weyburn, Sask., and seven Ontario communities, including Cobourg, Deep River, Fort Frances, Peterborough and Kapuskasing.
Canada Postal Workers Union members in the Nanaimo area are participating in rotating strike action on Wednesday, involving 185 members stretching from Lake Cowichan to Bowser.
The two sides have been unable to reach a deal after ten months of negotiations.
And, he says, the wage increases being offered are well-below the expected inflation rate.