PET Boston Round Containers PET Boston Round Containers from a 1 oz. size to a 16 oz. size. Looks like glass but performs like plastic. Four colors are available - Clear, Blue, Green and Amber. All Items 1 oz PET boston round plastic containers -- 1 oz. PET Boston Round - 20-410 2 oz PET boston round plastic containers -- 2 oz. PET Boston Round - 20-410 4 oz PET boston round plastic containers -- 4 oz. PET Boston Round - 24-400, 24-410 8 oz PET boston round plastic containers -- 8 oz. PET Boston Round - 24-400, 24-410 16 oz PET boston round plastic containers -- 16 oz. PET Boston Round - 24-400, 24-410