"GB/T 31556.1-2015 Encasement bag, Dimension description and Measuring method Part 1: Paper bag" stipulates the description and Measuring method of paper bag size. The paper bag related terms are clarified, covering the length, width, height and other size measurement rules of open paper bags, valve pockets and other types, as well as the measurement environment, tools and other requirements. It provides a standard basis for standardizing the size measurement of paper bags and ensuring the conformity and mass of paper bags. It is suitable for paper bag production, testing and other links.