- Inner Packs are smaller packaged groups of single unit products that are packed into a master case. Not all products are packaged in inner packs first but a lot of manufacturers end up breaking their master case quantities of contents down into these inner packs. For example, 1 x hairbrush is a single sellable unit in its own packaging. An inner pack consists of 5 of these individually packaged hairbrushes packed together in a carton or polybag. And there are 5 of these inner packs in the master case.