Is PET the best plastic for soft drinks packaging on environmental criteria?

Not specifically, although several LCA comparisons show excellent environmental benefits from the use of PET.  It is important to ensure that the material is 'fit for the purpose' and can be washed and cleansed adequately, in order to make its recycling easier.  Developments in PET materials, improvements in bottle manufacturing technology and lower temperature sterilisation techniques ensure that PET is the preferred material for such a demanding task, as at the same time it confers the benefits of light weight and low material usage.  This results directly in raw material and energy savings contributing to better environmental performance and to lower production costs.