Prefilled sterile dilution bottles are designed for sample dilution of water, dairy products, food, and pharmaceuticals prior to microbiological testing. With flip-top or screw-on lids, the containers are easy to open regardless of the material manufacturing. Dilution bottles feature wide mouths for easy measuring and filling, as well as graduated lines for more precise measuring. These bottles and lids are built of durable materials that can withstand repeated wet or dry sterilization.