The "white" label here refers to the blank label that the reseller can customize with its own branding. In this case, all of the Kirkland products you find, from the tortilla chips to those super-cheap whiskies, aren't actually produced in-house by Costco. Its signature tortilla chips are most likely produced by Mission Foods, a company that specializes in Mexican food products.
Sam's Club is introducing new, sustainable packaging for its Member's Mark seasoned rotisserie chicken, transitioning from a black, carbon-filled tray to a neutral sand-colored, recyclable material.