makes the other end open. Then the product is allowed to dispense freely. Both ribbed and smooth options are available. These are available unlined and lined and be sure to ask about our bulk pricing. How do I know these caps are right for my company and project? For every project, be sure to reach out to your Bay Area Bottles rep for free samples to test your container with your product(s) for compatibility. And don’t forget to ask for matching containers. Samples are free and often ship on the same day. We can also recommend the appropriate liner for you based on the container being used and the product going to the container.