Boston Rounds are one of the most popular bottles now-a-days, and for good reason. Boston Rounds feature a round cylindrical shape with short curved shoulders and a narrow screw neck. The traditional narrow opening pairs well with a multitude of closure options such as lotion pumps, sprayers, droppers, flip top caps, and many more.
Boston Rounds are common in glass (Flint, Cobalt Blue, Amber, Green) and plastic (in PET, HDPE, LDPE, PVC, and PP) from size as small as 0.5oz or lower, to 32oz or more. A list of Boston Round glass bottle can be found here and Boston Round bottles made of plastic can be found here.