Costco focuses on selling products at low prices, often at very high volume. These goods are usually bulk-packaged and marketed primarily to large families and businesses. Furthermore, Costco does not carry multiple brands or varieties where the item is essentially the same except when it has a house brand to sell, generally by the Kirkland Signature label. This results in a high volume of sales from a vendor, allowing further reductions in price, and reducing marketing costs. If Costco management feels the wholesale price of a product is too high, they will refuse to stock the product. For example, on November 16, 2009, Costco announced that it would stop selling Coca-Cola products because the soft-drink maker refused to lower its wholesale prices. Costco resumed selling Coca-Cola products on December 14, 2009. Costco also saves money by not stocking extra bags or packing materials; to carry out their goods, customers must bring their own bags or use the merchandise shipping boxes from the company's outside vendors.