SYSTEM INCLUDING POCKET

A system may include a surface (106), a pocket member (108), and spring members (118). The pocket member may have a top portion (110), a bottom portion (112), an exterior side (116), and an interior side (114). Each spring member may be positioned vertically between the surface and the interior side of the pocket member. Each spring member may have a spring top portion (120) and a spring bottom portion (122). Each of the spring top portions may be attached to the top portion of the pocket member. Each of the spring bottom portions may be attached to the surface at a location corresponding to a vertical position of the bottom portion of the pocket member. The surface, the pocket member, and the spring members may form a pocket configured to at a given time be one of: open at the top portion of the pocket member, open at the bottom portion of the pocket member, or closed.