The food packaging industry is vibrant and highly competitive, with food manufacturers always on the look-out for packaging that can provide consumers with increased convenience as well as longer shelf life at a lower cost than their existing packaging. The food industry is well aware that consumers want innovation and value novelty, and therefore the packaging industry must innovate or stagnate. Over the past few decades there have been significant changes in the relative proportions of the packaging materials glass, metal, paper and plastics used to pack food. Most noticeable has been the switch from glass and to a lesser extent metal to plastics with the majority of beverages nowadays packed in polyethylene terephthalate (PET).