Disclosed are polymer vials and injection stretch blow molding methods for making the same. A polymer vial has a base having a base surface area and a sidewall extending up from the base. The base and sidewall define an interior configured to house product, the sidewall narrowing at an upper section of the vial to form a neck leading to an opening that provides access to the interior. The vial is optionally round and symmetrical about a central axis, a lower portion of the sidewall including a first surface that is outwardly curved along a first radius having an imaginary center positioned within the vial. The base is positioned below the first surface and is substantially flat such that at least 80% of the base surface area has a standing base surface occupying a single plane.

A system for molding includes: right and left upper mold portions; and a lower mold portion, such that the right and left upper mold portions are positionable side by side and the lower mold portion is positionable between lower ends of the right and left upper mold portions to form an entire molding cavity for blow molding a connectable beverage bottle, such that the lower mold portion is vertically downward removable and the right and left upper mold portions are laterally removable after blow molding of the connectable beverage bottle. Also disclosed is a method of molding, including: preparing blow pin, assembling mold components, performing blow molding, removing blow pin, disassembling mold components, and extracting the connectable beverage bottle.