Chip packets are carefully designed to encourage people to buy the product. For example, the colour is important - many people associate different colours with different flavours.

The packet must also contain information about the product. This includes the ingredients, the weight, the manufacturer's name and address, the 'best before' date, and storage conditions.

Most manufacturers include 'nutrition information' on their packets, similar to the table opposite. Chips provide energy in the form of fats, carbohydrates and protein. They are also a rich source of dietary fibre, provide some important vitamins and minerals, and can be included as part of a balanced diet.