Abstract: A transportable bag cart for a self-supporting bag having an upstanding sidewall with a closed lower end and an open upper end, including a lower bag support platform and an upper anti-collapse, open frame receivable within the open upper end of the bag. The open frame includes a pair of spaced apart side bars spanned by a forward base. Mechanism is provided for mounting the anti-collapse mechanism on an upper portion of the cart frame including a pair of laterally spaced apart inverted U-shaped mount members having forward upstanding legs which are integrally coupled to the side bars and receivable within the bag.