Abstract: The invention provides a closure (106) for a compartment (100) having one or more walls (112, 114, 116 and 118) and an opening (110) defined by at least one of the walls (112, 114, 116 and 118). The closure (106) is associated with at least one fastener located inside the compartment (100). The fastener can hold the closure (106) in a first position (e.g. closed) relative to the opening (110). The fastener is adapted to cause the closure (106) to assume a second position (e.g. open) relative to the opening (110) upon receipt of a suitable signal. The closure (106) has at least on indicium (108) visible from outside the compartment (110). The indicium (108) is adapted to provide a visual indication of a status of the closure (106) or the compartment (110), such as closure open, closure closed, compartment empty, compartment occupied.