A support kit for at least one piece of bag having a support frame configured to be able to be associated with a motorcycle frame, which includes at least one tubular element having one or more through holes, one or more support components adapted to be detachably associated with the support frame and with the at least one piece of bag. The support kit further includes at least one support clamp having a first jaw and a second jaw which embraces portions of the at least one tubular element and respectively has a first and a second through hole. The kit also includes a guide screw that crosses the through holes which includes a support element adapted to support at least one portion of the at least one piece of bag.