The B031 is a 1 gallon natural-colored HDPE plastic wide-mouth pill packer bottle with 110-400 neck finish. This container has a wider proportional mouth than normal bottles. Packers come in a variety of sizes, but they are typically "squatty" in shape with a wider mouth. Packers are used extensively for pills, capsules, supplements, powders, and other health-related products. High density polyethylene (HDPE) is marked with the resin identification code of 2. HDPE has a high tensile strength, good resistance to chemicals, good impact resistance, highly rigid, and highly scratch resistant. This item has a 110-400 neck finish. The first number refers to the diameter (in mm), and the second refers to the closure depth, style and thread. This container can be paired with a closure with a matching finish. Natural-colored containers are not actually colored. This is the natural color of the plastic, which is a milky translucent color. This translucent color shows product level, or how full (or, if you're a pessimist, how empty) the container is.
Please read How Many Pills in a Packer Bottle?