Ensure a secure shipping solution for your bottles with Labelmaster's Bottle Caps. Available for glass or poly bottles of all shapes and sizes, these should be chosen based on the content's chemical compatibility, dispensing/storage requirements and transportation regulations. Next, match the mouth size of your bottle to the cap. Each cap size is shown as two units (e.g., 22/400) with the first number being the mouth size (bottle opening), and the second number being the bottle thread dimension. Finally, be sure to choose the proper closure for the bottle, which is determined by compatibility and mouth size. With such a wide selection of bottle caps, as well as free samples to make sure you order the correct size and material, we are your trusted source for completing your bottling solution.