A bag clamp having at least two coaxial retention arms, capable of rotating about a pivoting axis between an open and closed position. The retention arms are connected to a mechanism housing that has an ability to lock and release the retention arms at various degrees of rotation about the pivoting axis. The arms have a shape such that there are only two possible points of contact between the arms to create an open receiving space. The open receiving space allows the bag clamp to receive a rigid structure to clamp onto while also receiving a bag's straps.