The PartyCap is the best universal festival cap that you can also take with you in your key ring. This universal festival cap has thread on 2 sides so that it fits almost all bottles. Better than those rubber caps that also leak into your bag. Always annoying when you get a bottle and don't get a cap with it. This is a thing of the past with this handy universal festival cap. Getting out of your seam carefree without drinking knocking over you or putting in any means you'd rather not have. This cap is made of biodegradable material, so woke.