Abstract: This invention comprises apparatus and processes for use thereof for selectively holding, retaining, supporting, and/or securing objects upon one or more shelves, and prevent such objects from inadvertently falling therefrom. The apparatus generally comprises a flexible, elastic barrier, or barrier having a elastic membrane therein, that permits: observation and inspection of objects contained within an interior compartment or enclosure on the shelf; the barrier to be stretched and pulled aside to allow access to the compartment or enclosure; and when released, retracts back to an original position to function as a barrier that retains objects within the compartment or enclosure and prevent the inadvertent escape of such objects contained therein. Furthermore, the present invention can be used without necessarily requiring permanent alteration, modification, and/or defacement of the shelf or its adjacent cabinet structure.