A bag rack (10, 110, 210) including a base (12, 112), side walls (18, 20, 114, 116), a back wall (22, 118) and a pair of L-shaped bag support arms (32, 160, 162). Side walls (18, 20, 114, 116) are releasably joined and secured to back wall (22, 118) by the upright legs (30, 146) of bag support arms (32, 160, 162) by means of a series of interlocking, aligned slots (26, 28, 142, 144). A rear slot (42, 172) is provided between back wall (22, 118) and base (12, 112) to allow the bottom edges of a multiplicity of bags carried by a hook (37, 156) to extend back of base (12, 112). An embodiment of the back rack (110) is shown in which the bag supporting arms (160, 162) are coupled together by a transversely extending rear extension (164), which cooperatively engages a structure, preferably pairs of channels (168, 170), on the back wall (118) of the bag rack (110) to secure the bag supporting arms (160, 162) in a desired vertical height and to transfer cantilever loading of the bag supporting arms (160, 162) to the back wall (118).