The front of the enclosed cart body has an access opening. A fixed panel is situated below the opening. A flexible panel is mounted for movement from a lower position aligned with the fixed panel to an upper position aligned with and covering the opening. A wedge-shaped protrusion on the fixed panel retains the movable panel in the upper position. The movable panel is flexed to become arcuate such that the protrusion is bypassed as the panel is moved from the upper position towards the lower position. The movable panel can be locked in the upper position to the top panel. The top panel may be stationary or may pivot to open the top of the enclosure for facilitated access.