The profitability of food retailing is very dependent on maximizing efficiencies throughout the supply chain. One strategy that I have been noticing more and more is the use of heavy plastic shrink wrap to bundle individual items into one big armload.
bag-of-bags
Grouping items together like this is important for products that are shipped on pallets. That paper bag of flour you are buying was carried to the shelf along with nine of his friends bundled up in plastic shrink wrap. The groups of ten rode to the store on a pallet along with a block of other ten packs all held together with several layers of plastic stretch wrap