Around 1200 DHL workers have planned a four-hour work stoppage at 23 warehouses in NSW and Victoria on Monday.
The United Workers Union has been trying to negotiate new workplace agreements since March, including a 21 per cent pay rise over three years for NSW workers, and 10 per cent each year for three years for Victorian workers.
The stoppage will impact big brands including Mattel, Nike, Australia Post, Samsung, and the union said it had contacted DHL to ensure life-saving medicine deliveries would not be affected.
"This is a cost-of-living strike," UWU National Secretary Tim Kennedy said in a statement.
"Workers at DHL sites are earning below industry standards, working very hard to make ends meet."
The union has also complained about a proposal to pay new employees less.
"How can they justify lower new starter rates when cost of living is going up?" DHL workers wrote in a statement.
"It can cause friction between people who do the same role for different pay rates, that isn't fair."
DHL has been contacted for comment.
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