Packaging Options Direct carries a wide selection of plastic cylinder round bottles in PET and LDPE. These bottles are characterized by straight sides and square shoulders which makes them extremely easy to label. PET Cylinder Round bottles are great for a variety of uses including household cleaners; while LDPE Cylinder Round bottles are more pliable and are great for more viscous products; such as hair products. Pair with a continuous thread, press top, or lotion pump closure for the perfect package. Sizes range from 2 oz to 32 oz.