The 10x13 size is the workhorse of e-commerce, perfect for apparel, books, small electronics, and bundles. The material (polyethylene) offers durability and water resistance while being incredibly lightweight, helping to minimize shipping costs, a major plus for U.S. shippers who pay by weight and zone.To guide you on how to choose 10x13 poly mailer designs for maximum impact, here are the most popular and future-forward trends. These poly mailer design trends 2025 prioritize aesthetics, brand messaging, and sustainability.