There are many steps required to take a product from prototype to the shelf at your favorite retailer. You need to have all the required certifications, proper quality control during manufacturing, the packaging designed and delivered, the shipping boxes properly marked per the retailers requirements, and then the right quantities need to packed and shipped to the various receiving warehouses on time.
Top retailers have very demanding requirements regarding shipping and delivery dates. They simply must in oder to deal with the quantities of deliveries they receive. If you do not ship enough product or your delivery is late you may be subject to substantial fines.
Having a trusted supplier network, including packaging designers and manufacturers, helps us to avoid these hiccups in the supply chain. Not only do all the various requirements need to be accounted for, they need a responsible party to manage the process so nothing falls through the cracks.