A 3 ply plain corrugated box is a packaging box made of three layers of corrugated cardboard material without any external printing or design. These boxes are commonly used for shipping and storing a wide range of products, including electronics, clothing, books, and more. The three-ply construction of these boxes provides excellent strength and durability, making them a reliable option for protecting products during transportation and handling. The plain design allows for easy labeling or customization, making them a versatile option for many businesses.