The kind of packaging needed to contain a product depends on the physical form of the product and the nature of the porduct itself. Products come in all shapes and sizes and they also react in different ways to their surroudings. Fox example, a corrosive chemical needs to be contaiined in a pack that does not allow the chemical to leak, react with its aurroundings,react with its packaging or become contaminated. all need to be considered before designing or modifying the type of packaging used.