6. Huggies

Kimberly-Clark is an American multinational corporation responsible for manufacturing a variety of products, including diapers. This brand has been confirmed as the producer of both Huggies and Kirkland’s diapers.

This information was confirmed in 2017 by Costco’s finance chief, Richard Galanti, in an interview with The Wall Street Journal. He explained that Costco had approached two rival companies to produce their diapers: Kimberly-Clark and Procter & Gamble. However, the deal was ultimately made with Kimberly-Clark.