Inner Packs Per Master Pack (IPMP) is a term used to describe the packaging structure for Amazon shipments. For example, a master carton may contain multiple inner packs. Here’s how it works:

1 Carton contains 4 inner packs.
Each inner pack adheres to the IPIP (Items Per Inner Pack) requirements, meaning it contains 4 units.
Consequently, the total number of individual sellable units in the carton is 16.
Each of the 16 units has its own UPC barcode, while the master carton, which holds all 4 inner packs, is labeled with a GTIN-14 barcode. This setup ensures proper tracking and inventory management. It’s a bit like “Cartception,” with layers of packaging and barcodes for streamlined processing.