2 Liter Natural HDPE Liquid Lawn Fertilizer bottle with 4 oz Dosage Chamber, 38mm & 28mm | luzernpackaging This bottle is a 2 liter and 4 fl. oz. 28 mm (28-400) and 38 mm (38-400) natural high-density polyethylene (HDPE) plastic twin neck bottle. It has two chambers, one for storing and the other for measuring exact doses. The second chamber is designed to eliminate additional measuring by providing a precise pour every time. The measuring chamber holds 4 oz/120 ml of liquid in increments of 1 oz/20 ml. To use, squeeze the bottle to fill the measuring chamber with desired amount of liquid. Then, remove the cap and easily pour measured liquid from the chamber. The twin neck bottle is often used for industrial, as well as agricultural and animal care products.