1 oz (30 ml) Natural HDPE wide mouth lab style bottle with 28-415 natural polypropylene linerless cap attached. Nalge wide mouth HDPE lab style bottles are supplied with linerless polypropylene caps. Excellent chemical resistance and the leak resistant closure make these ideal for storing, shipping and packaging liquids for long periods. HDPE bottles are ideal for high-speed filling, demanding pharmaceutical specifications and the rough handling of interstate shipping. Linerless white polypropylene caps are known for good impact strength, cost effectiveness, and pliability. caps attached to the convenience pack and enclosed on the bulk pack.