Abstract: Device for closing and coupling carryall cases having a shell and a counter-shell which are mutually hinged, the shell being provided with brackets for coupling to racks of a motorcycle. The device has a shaped plate fixed inside an accommodation seat defined within the shell. The shaped plate has first pivoting lugs for linkages which define a first pivoting axis for lever systems for coupling to the counter-shell and a second pivoting axis for a locking plate. The shaped plate has second pivoting lugs for a handle of the case, and the locking plate is provided with a lock and bolt mechanism for closing the device and with an opening for permitting uncoupling of the carryall case from a motorcycle. A snap-action release button connects the linkages to the first pivoting lugs and connects the handle to the second pivoting lugs. The handle has a cross-member which, in closed position, is interposed between the lever systems and the locking plate.