MESE Reagent Bottle 100, 250, 500, 1000, and 2000ml - Borosilicate Glass - with Blue Screw Cap. Reagent Bottle made of Borosilicate Glass, Clear, With GL45 Standard Size PP Plastic Cap & Ring. These heavy-duty bottles can be used for storage as well as mixing and sampling. Bottles have permanent white enamel graduations and marking spots.