Items\u2014including gourmet products\u2014are evaluated and rated by participants in a controlled event, which can be coordinated by software locally or at a dedicated website. The scoring allows users to have input into the scoring to determine relevancy and authenticity to solve particular problems. At the same time, a region where no images are formed is provided between the right eye and left eye observation regions, because no actual observation is carried out in the region. In one example, the sack also includes a mechanism that facilitates maintaining the open end of the sack in any of the various degrees of opened andor closed conditions. A method for filtering gaseous hydrocarbons from an air flow is also provided. Example articles of enclosing manufacture may include a liner or a rod that is configured as a sacrificial anode to protect a metallic side or end wall of the enclosing manufacture from corrosion.