In the context of packaging, especially corrugated boxes, the terms 3-ply, 5-ply, and 7-ply refer to different types of construction based on the layers of material used to make the box. Here’s what each term typically denotes:



These ply ratings indicate the number of layers of materials used in the corrugated board construction. The more layers (higher ply), the stronger and more durable the box tends to be, offering varying degrees of protection depending on the specific application and requirements.