16 oz amber glass boston round bottles are available with black child resistant caps. The large amber glass bottles are impermeable, preventing product alteration, and feature sloped shoulders and a narrow neck typical of the boston round style. Amber glass bottles provide substantial UV barriers for products stored inside. The universal pictured, child resistant caps paired with these small glass bottles feature PE liners. The liners are composed of a compressible PE foam that creates a stable seal. PE liners ensure low moisture transmission and provide good resistance to acids, alkalis, solvents, alcohol, oil, household cosmetics, and aqueous products. Try using these small amber bottles when packaging pharmaceuticals, minerals, or chemicals.