A filter baffle assembly, including a filter cap engageable to the mouth of a container, the filter cap including a filter vent situated the filter cap, and a gas permable baffle interposable between the mouth of the container and the filter vent, the baffle protecting the filter vent from contact with the contents of the container. A gas permeable baffle for protecting a filter vent from contents of a container, the baffle including at least one perforation, the baffle being interposable between a container mouth and a filter vent housed within a container cap. A method of protecting a filter vent from the contents of a container, including the steps of sealingly engaging a gas permeable baffle to the mouth of a container; engaging a filter cap, including a filter vent, to the mouth of the container; permitting gas exchange between the container interior and the filter vent, through the baffle; and, with the baffle, protecting, the filter vent from contact with container contents.