Bottle sizes come in 100 mL, 250 mL, 500 mL, 1 L, 2 L, 3 L, 5 L, 10 L and 20 L quantities, with a choice of clear or amber glass. PUREGRIP™ flasks range from 250 mL to 5 L. Volumetric gradations are applied using advanced calibration instruments—each PUREGRIP™ glass product is individually certified for accuracy.