Abstract: A wire rack for supporting a box or carton containing a roll of flexible plastic bags with the rack being capable of quick and easy supporting engagement with the upper edge of a trash receptacle, janitorial cart and the like. In one embodiment, the wire rack is curved in a manner to conform with and engage the upper open end of a large waste receptacle of cylindrical configuration. In another embodiment, the wire rack is straight for mounting on the upper end of a maid's or janitor's cart. In both embodiments of the invention, the wire rack includes a locking arrangement by which opposite legs of the rack which straddle the box or carton will lockingly engage with a slotted end of the carton with the inner end of the locking arrangement being inserted into the hollow core on which the roll of plastic bags are wound.