In marketing literature, packaging is considered to form part of the product and the brand. So, for example, for Evans and Berman (1992) packaging is a product property or characteristic, whereas for Olson and Jacoby (1972) packaging is an extrinsic element of the product, that is to say, it is attribute that is related to the product but that does not form part of the physical product itself. Price and brand are also extrinsic elements of the brand and according to Underwood et al. (2001); these are the most important extrinsic values when it comes to deciding what food products to buy. Keller (1998) also considers packaging to be an attribute that is not related to the product. For him it is one of the five elements of the brand together with the name, the logo and/or graphic symbol, the personality and the slogans. Packaging is presented as part of the buying and consuming process, but often it is not directly related to the ingredients that are essential for the product to function (Underwood, 2003).