The unionized Costco workers are on a contract that expires Jan. 31, according to their Teamsters representatives.

Find out why more than 18,000 Costco workers have voted in favor of a strike warehouses across the country — and what it could mean for shoppers.

More than 18,000 Costco workers will be walking picket lines in less than two weeks if a labor dispute over wages and benefits is not resolved, according to the Teamsters union. Members voted by an 85% margin to authorize a strike when their current contract expires on Jan. 31, the union announced on Sunday.