described herein are devices pertaining to the closure of containers having at least one opening , such as bags . these devices can have at least one connecting structure configured to fit over at least a part of the container &# 39 ; s opening , with the connecting structure being connected to at least two sides of the container . in some embodiments , the closure devices have base structures that the connecting structure can connect to and / or be held in place by . in some embodiments , these base structures are configured such that they substantially conceal the portion of the container to which they are connected . in some embodiments , the base structures have festive shapes , for example , being shaped like a birthday cake or flowers . coupled with the ability to conceal the underlying container , the closure devices can effectively transform a basic paper bag into an enclosed festive gift bag .