Abstract: Clamping conveyor for transporting containers of various sizes and to invert the containers during transportation. The containers are conveyed on a movable flexible endless support member to which are fixed a series of spaced clamping assemblies each of which comprises an open ended housing secured transversely to the support member, an L-shaped container gripping member having a base arm slidably extending into and being guided by the housing and having a clamping arm upstanding from the plane of the support member on one of its sides and a spring assembly which acts on the L-shaped gripping member to bias the clamping arm toward the support member. The successive clamping arms of these L-shaped members are disposed on opposite sides of the support member and interconnected by a pair of endless belts each located on one side of the support member and secured to the clamping arms. The support member is mounted on a stationary track allowing it to pivot axially by substantially 180.degree.