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A shopping cart tray includes a trapezoidal bottom plate, a front plate, a rear plate, and right and left side plates. The trapezoidal bottom plate is configured to fit in a loading space of a shopping cart. The front plate extends from a front side of the trapezoidal bottom plate. The rear plate ex

A shopping cart tray includes a trapezoidal bottom plate, a front plate, a rear plate, and right and left side plates. The trapezoidal bottom plate is configured to fit in a loading space of a shopping cart. The front plate extends from a front side of the trapezoidal bottom plate. The rear plate extends from a rear side of the trapezoidal bottom plate. The right side plate extends from a right side of the trapezoidal bottom plate. The left side plate extends from a left side of the trapezoidal bottom plate. The shopping cart tray fits into the shopping cart and maximize a usage of the loading space. The dimension of the trapezoidal bottom plate is slightly smaller than a dimension of the loading space of the shopping cart.

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1. A shopping cart tray comprising: a trapezoidal bottom plate configured to fit in a loading space of a shopping cart;a front plate extending from a front side of the trapezoidal bottom plate;a rear plate extending from a rear side of the trapezoidal bottom plate;a right side plate extending from a

1. A shopping cart tray comprising: a trapezoidal bottom plate configured to fit in a loading space of a shopping cart;a front plate extending from a front side of the trapezoidal bottom plate;a rear plate extending from a rear side of the trapezoidal bottom plate;a right side plate extending from a right side of the trapezoidal bottom plate;a left side plate extending from a left side of the trapezoidal bottom plate; anda central folding line provided in a middle portion of the trapezoidal bottom plate, which enables for the shopping cart tray to be folded by halves, facilitating stacking of a plurality of shopping cart trays,wherein the shopping cart tray is configured to fit into the shopping cart and maximize a usage of the loading space,wherein each of the front plate, the rear plate, the right side plate, and the left side plate is tilted outwards by a predetermined angle, such that a plurality of shopping cart trays are adapted to be partially fit in and stacked vertically. 2. The shopping cart tray of claim 1, wherein a dimension of the trapezoidal bottom plate is slightly smaller than a dimension of the loading space of the shopping cart. 3. The shopping cart tray of claim 1, wherein the predetermined angle is about 15 degrees. 4. The shopping cart tray of claim 1, wherein the trapezoidal bottom plate is fit into substantially entire bottom surface of the loading space of the shopping cart. 5. The shopping cart tray of claim 1, wherein the trapezoidal bottom plate is fit into a partial bottom surface of the loading space of the shopping cart. 6. The shopping cart tray of claim 1, wherein the shopping cart tray is made of paper. 7. The shopping cart tray of claim 1, wherein the shopping cart tray is made of plastic or wood. 8. The shopping cart tray of claim 1, wherein meeting lines among the trapezoidal bottom plate, the front plate, the rear plate, the right side plate, and the left side plate are slightly foldable. 9. The shopping cart tray of claim 1, further comprising two groove-cuts provided along a top edge of the front plate. 10. The shopping cart tray of claim 1, wherein the predetermined angle is from about 15 degrees to about 45 degrees. 11. The shopping cart tray of claim 10, wherein the predetermined angle is about 30 degrees. 12. A shopping cart tray set comprising: a first tray comprising: a first trapezoidal bottom plate configured to fit in a front portion of a loading space of a shopping cart;a first front plate extending from a front side of the first trapezoidal bottom plate;a first rear plate extending from a rear side of the first trapezoidal bottom plate;a first right side plate extending from a right side of the first trapezoidal bottom plate;a first left side plate extending from a left side of the first trapezoidal bottom plate; anda first central folding line provided in a middle portion of the first trapezoidal bottom plate, which enables for the first tray to be folded by halves, facilitating stacking of first trays,wherein the first tray is configured to fit into the front portion of the shopping cart and maximize a usage of the loading space, anda second tray comprising: a second trapezoidal bottom plate configured to fit in a rear portion of a loading space of a shopping cart;a second front plate extending from a front side of the second trapezoidal bottom plate;a second rear plate extending from a rear side of the second trapezoidal bottom plate;a second right side plate extending from a right side of the second trapezoidal bottom plate;a second left side plate extending from a left side of the second trapezoidal bottom plate; anda second central folding line provided in a middle portion of the second trapezoidal bottom plate, which enables for the second tray to be folded by halves, facilitating stacking of second trays,wherein the second tray is configured to fit into the rear portion of the shopping cart and maximize a usage of the loading space,wherein the rear plate of the first tray has a substantially same and matching size as the front plate of the second tray,wherein each of the first and second front plates, the first and second rear plates, the first and second right side plates, and the first and second left side plates is tilted outwards by a predetermined angle, such that the shopping cart tray set is adapted to be stacked vertically. 13. The shopping cart tray set of claim 12, wherein the predetermined angle is about 15 degrees. 14. The shopping cart tray set of claim 12, further comprising one or more handle holes through side plates, wherein the each of the one or more handle holes is made of folded double layers of the side plate.