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The 2026 Iran war and resulting Strait of Hormuz closure have severed roughly 42% of Japan's naphtha supply, a petroleum derivative essential for printing inks, plastics, and adhesives. Japanese snack giant Calbee became the most visible casualty when it announced monochrome packaging for 14 flagship products, but the disruption extends across 77% of Japan's food and beverage sector and is rippling through global packaging supply chains from Tokyo to Chicago.