the present invention relates to a parison and container made from an aromatic polyester composition with improved strain hardening . the polyester composition exhibits a low deg content , a natural stretch ratio of & lt ; 10 , a half time of crystallization of & gt ; 150 sec at 200 ° c . and comprises a sulfo - modified copolymer . the invention further relates to a process for making small volume containers . compared to polyesters of the prior art , the polyester of the present invention exhibits superior stretching characteristics , such as a lower natural stretch ratio , which allows for production of small pet bottles via thinner and longer pansons . such thinner and longer pansons improve the production of small containers due shorter cooling cycles .