Packaging Options Direct offers a vast selection of plastic Boston Round bottles made of PET and LDPE plastic. Boston Round bottles are characterized by their cylindrical shape and short curved shoulder. PET Boston Round Bottles are great for a variety of uses; while LDPE Boston Round bottles are more pliable and are great for more viscous products. These bottles are ideal for packaging both liquid and solid products. With multiple closure options available, you will be sure to find the perfect match for your packaging needs. Sizes range from 2 oz to 16 oz.