This 500mL (16oz) square bottle is made of natural polypropylene copolymer and comes with a leakproof, linerless polypropylene cap. It has a wide mouth for easy filling and pouring. The square design is easy to grip and helps save shelf space. This autoclavable bottle has durable, uniform walls that are resistant to splitting or puncturing. Manufactured in compliance with ISO 13485:2003 quality requirements. Autoclavable. Bulk Packed. Bottle Material: Polypropylene Copolymer (PPCO). Bottle Shape: Square. Neck Type: Wide Mouth. Closure Material: Polypropylene. Height With Closure: 146mm. Outer Diameter: 74 x 74mm. Neck Inner Diameter: 43mm. Neck Finish: 53-415. Capacity: 500mL (16oz). Nalgene® #: 312110-0016.