High load capacity collapsible carts

A cart comprising:

• a rigid frame forming a compartment, the rigid frame comprising a front wall, a rear wall, a right sidewall, a left sidewall, and a pivotable base panel;
• wherein the pivotable base panel is pivotably connected to a bottom of the front wall or a bottom of the rear wall, the pivotable base panel having a lower surface opposite an upper surface, the upper surface forming a bottom floor of the compartment;
• wherein the pivotable base panel is configured to pivot between being disposed parallel to the front wall and rear wall for storage or being disposed perpendicular to the front wall and the rear wall when in use forming the bottom floor of the compartment;
• wherein the right sidewall and the left sidewall are configured to fold inwardly into the compartment allowing the cart to collapse for storage;
• a rigid cover panel conforming in shape to a top opening of the compartment, the rigid cover panel configured to securely fit in a first position over the top opening to serve as a cover and/or a seat;
• wherein the rigid cover panel is movably attached to a top of the front wall by a hinge mechanism, the rigid cover panel configured to be moved to a second position residing adjacent the front wall outside the compartment;
• wherein the hinge mechanism at a proximal end is pivotably connected to the top of the front wall, wherein the hinge mechanism is configured to pivot about a first axis that is parallel to the front wall;
• wherein the hinge mechanism at a distal end is rotatably connected to the rigid cover panel, wherein the rigid cover panel is configured to rotate about a second axis;
• and
• wherein the second axis is perpendicular to the first axis.

A cart comprising:

• a rigid frame forming a compartment, the rigid frame comprising a front wall, a rear wall, a right sidewall, a left sidewall, and a pivotable base panel;
• wherein the pivotable base panel is pivotably connected to a bottom of the front wall or a bottom of the rear wall, the pivotable base panel having a lower surface opposite an upper surface, the upper surface forming a bottom floor of the compartment;
• wherein the pivotable base panel is configured to pivot between being disposed parallel to the front wall and rear wall for storage or being disposed perpendicular to the front wall and the rear wall when in use forming the bottom floor of the compartment;
• wherein the right sidewall and the left sidewall are configured to fold inwardly into the compartment allowing the cart to collapse for storage;
• and
• a retractable handle mechanism disposed at, within or adjacent the back wall;
• wherein the retractable handle mechanism comprises a hand grip attached to a telescoping assembly;
• wherein the hand grip is attached at a distal end of the telescoping assembly and the telescoping assembly is pivotably attached at a proximal end to the bottom of the rear wall.