Costco sells off the pallet, so the warehouse is the store

Most retailers carry tens of thousands of SKUs and receive them stacked in boxes, then open the cartons, line the shelves and keep a back room of reserve stock. Each step costs labour and space, and every extra SKU adds complexity to ordering, receiving and storing.

Costco does the opposite. Having fewer, mostly one-per-category items — roughly a few thousand SKUs instead of 10,000-plus — lets it buy and display almost everything as a full standard 40x48-inch pallet. A warehouse receives it, a forklift sets it on the sales floor, the protective wrap is taken off, and it is ready to sell.

The trick is that the store is its own warehouse. Because a whole SKU is a whole pallet, there is almost nothing between arrival and customer: no unpacking, no back-room handling, no restocking by hand. Suppliers are even set the packaging dimensions so a pallet can hold four 'shelves' with four 'faces' each and be stacked two high in a standard trailer.

Costco's packaging consultant, Michael Carrier, notes the company's guidance pushes suppliers to use the minimum material that still works. The result is a retail operation where the supply chain is dramatically shorter and simpler, which is a big part of how Costco keeps prices low despite thin margins.

Make the pallet the display unit

A limited number of SKUs means each one can be bought as a full pallet

The pallet is forklifted straight onto the floor and its wrap is cut off

No back-room storage and almost no hand restocking at the store

Standard 40x48 dimensions let pallets stack two high in a trailer

If you limit the range, you can make each unit a full load; then the retail store and the warehouse are the same building and the handling in between disappears.

Costco's model became the standard example of a warehouse club that compresses its own supply chain, and its pallet-first store layout is credited with low prices and fast stock turns. Suppliers design packaging to Costco's dimensions to make pallets display cleanly and stack efficiently, and the company's private-label Kirkland brand extends the same logic of fewer, controlled SKUs.