This 30mL (1oz) natural high-density polyethylene (HDPE) round-shaped bottle has a wide-mouth designed for ease of filling and dispensing, and comes with a natural polypropylene closure. The leakproof bottle offers excellent chemical resistance, with uniform walls that resist splitting and puncturing. Bulk Packed. Leakproof. Bottle Material: High-Density Polyethylene (HDPE). Bottle Shape: Round. Neck Type: Wide Mouth. Closure Material: Polypropylene. Height With Closure: 63mm. Outer Diameter: 34mm. Neck Inner Diameter: 21mm. Closure Size: 28mm. Neck Finish: 28-415. Capacity: 30mL (1oz). Nalgene® #: 312104-0001.