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A stackable shipping unit includes a plurality of individual components that may be partially assembled, then packed with items to be shipped. The shipping unit can then be fully assembled, and placed on a pallet. The shipping system may include trays that can be used as either a base or a lid. The

A stackable shipping unit includes a plurality of individual components that may be partially assembled, then packed with items to be shipped. The shipping unit can then be fully assembled, and placed on a pallet. The shipping system may include trays that can be used as either a base or a lid. The unit includes vertical components that are generally U-shaped in plan view, and sized to fit closely within the trays in pairs to form a “H” shape in plan view forming a pair of shipping spaces. Additional U-shaped vertical components can then be assembled to close off the shipping spaces, and a tray can be used as a lid and positioned on top of the vertical components to form an assembled shipping unit.

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1. A method of forming shipping containers, comprising: providing a plurality of horizontal members having quadrilateral perimeters and upstanding edge walls extending around the perimeter to define an outwardly-opening space;providing first, second, third, and fourth upstanding dividers, each havin

1. A method of forming shipping containers, comprising: providing a plurality of horizontal members having quadrilateral perimeters and upstanding edge walls extending around the perimeter to define an outwardly-opening space;providing first, second, third, and fourth upstanding dividers, each having a U-shape in plan view formed by a central wall and transverse end walls, wherein the first, second, third, and fourth upstanding dividers are substantially identical to one another;positioning first and second dividers on a horizontal member that has been positioned for use as a base with the space opening upwardly and receiving lower edge portions of the first and second dividers therein, wherein the central walls of the first and second dividers extend across a central portion of the horizontal member to define side-by-side shipping spaces, and wherein the end walls of the dividers extend along inside surfaces of a selected pair of the edge walls;positioning items to be shipped in the shipping spaces;positioning the third and fourth dividers adjacent the first and second dividers, respectively, with end walls of the first and third dividers overlapping, and wherein end walls of the second and fourth dividers overlap; and:positioning a horizontal member on top of the dividers to form an assembled container. 2. A method of forming shipping containers, comprising: providing a plurality of horizontal members having quadrilateral perimeters and upstanding edge walls extending around the perimeter to define an outwardly-opening space;providing a plurality of upstanding dividers, each having a U-shape in plan view formed by a central wall and transverse end walls;positioning first and second dividers on a horizontal member that has been positioned for use as a base with the space opening upwardly and receiving lower edge portions of the first and second dividers therein, wherein the central walls of the first and second dividers extend across a central portion of the horizontal member to define side-by-side shipping spaces, and wherein the end walls of the dividers extend along inside surfaces of a selected pair of the edge walls;positioning items to be shipped in the shipping spaces;positioning third and fourth dividers adjacent the first and second dividers, respectively, with end walls of the first and third dividers overlap, and wherein end walls of the second and fourth dividers overlap;positioning a horizontal member on top of the dividers to form an assembled container;providing at least four first dividers having a first height and a first shape in plan view;providing at least four second dividers having the first shape in plan view and having a second height that is not equal to the first height;providing a plurality of horizontal members that can be used as covers and bases with both the first dividers and the second dividers;assembling at least first and second containers having the first and second heights; andpositioning at least one second assembled container on top of the first assembled container to form a stack of containers. 3. The method of claim 2, wherein: the heights of the first and second assembled containers can be combined to provide an overall height that is about ninety-six inches. 4. The method of claim 3, wherein: the first height comprises twenty-four inches, and the second height comprises forty-eight inches, and wherein:the stack comprises two of the first containers and one of the second containers. 5. The method of claim 1, wherein: the assembled container has a height of about sixteen inches, and including:assembling at least six containers utilizing substantially identical horizontal members and dividers;stacking the containers to form a stack having a height of about ninety-six inches. 6. The method claim 1, including: providing a plurality of dividers that are sixteen inches high, twenty-four inches high, thirty-two inches high, thirty-six inches high, and forty-eight inches high;selecting dividers having combinations of heights totaling about ninety-six;assembling a plurality of containers;positioning items to be shipped in each container;stacking the containers. 7. The method of claim 6, including: placing the containers in a vehicle at a first location;transporting the containers to one or more delivery locations;disassembling the containers;transporting the containers back to the first location in a disassembled condition. 8. A method of forming shipping containers, comprising: providing a plurality of horizontal members having quadrilateral perimeters and upstanding edge walls extending around the perimeter to define an outwardly-opening space;providing a plurality of upstanding dividers, each having a U-shape in plan view formed by a central wall and transverse end walls;positioning first and second dividers on a horizontal member that has been positioned for use as a base with the space opening upwardly and receiving lower edge portions of the first and second dividers therein, wherein the central walls of the first and second dividers extend across a central portion of the horizontal member to define side-by-side shipping spaces, and wherein the end walls of the dividers extend along inside surfaces of a selected pair of the edge walls;positioning items to be shipped in the shipping spaces;positioning third and fourth dividers adjacent the first and second dividers, respectively, with end walls of the first and third dividers overlap, and wherein end walls of the second and fourth dividers overlap;positioning a horizontal member on top of the dividers to form an assembled container; and wherein:the items to be shipped are positioned in the shipping spaces after the first and second dividers are positioned on the horizontal member, but before the third and fourth dividers are positioned on the horizontal member. 9. A method of forming a shipping container system for plants, comprising:forming a base having a horizontal central sheet and upstanding edge walls defining a generally quadrilateral perimeter such that the base defines a shallow space that opens upwardly;forming a vertical divider structure comprising at least first, second, third, and fourth upstanding dividers, each divider having an upstanding central wall with vertically extending opposite edge portions, each divider further including a pair of planar end walls extending transversely from the opposite edge portions of the central wall, wherein each pair of planar end walls are parallel to one another and define a horizontal dimension therebetween and vertical end edges such that each divider is generally U-shaped in plan view and defines upper and lower edge portions;positioning the lower edge portions of the first and second dividers in the upwardly opening shallow space of the base inside the edge walls with the central walls of the first and second dividers being directly adjacent one another and extending across a central portion of the shallow space with the end walls of the first and second dividers extending in opposite directions just inside of the upstanding edge wails to thereby form an H-shape in plan view defining first and second spaces utilizing the first and second dividers, wherein the first and second spaces are separated by the adjacent central walls of the first and second dividers and wherein the vertical end edges define openings having a width equal to the horizontal dimension;positioning the third divider adjacent the first divider with the central wall of the third divider being spaced apart from the central wall of the first divider with the end walls of the third divider overlapping the end walls of the first divider;positioning the fourth divider adjacent the second divider with the central wall of the fourth divider being spaced apart from the central wall of the second divider with the end walls of the fourth divider overlapping the end walls of the second divider whereby the vertical divider structure defines a generally quadrilateral outer perimeter in plan view and a central space that is divided into first and second spaces by the central walls of the first and second dividers;forming a cover having a generally quadrilateral perimeter and downwardly extending edge walls forming a shallow downwardly opening space;positioning the cover on the vertical divider structure with a central portion of the cover extending over the upper end portions of the first, second, third, and fourth dividers. 10. The method of claim 9, including: forming the end walls of the dividers in an orthogonal relationship relative to the central walls of each divider. 11. The method of claim 10, including; forming the base and the cover to have substantially the same size and shape. 12. The method of claim 9, including: removably engaging the dividers with the base and the cover;disassembling the container without damaging the components forming the shipping container. 13. The method of claim 9, including: folding thin sheets of material to form the base, cover, first divider, second divider, third divider, and fourth divider into their respective shapes. 14. The method of claim 13, wherein: the thin sheets of material comprise cardboard. 15. The method of claim 9, including: forming at least one enlarged opening that is about three inches across through at least one of the central wall and the end walls of at least one divider. 16. The method of claim 9, wherein: the upstanding central wall and the end walls are formed from sheets having substantially planar opposite side surfaces and linear upper and lower edges. 17. The method of claim 9, including: forming a second shipping container having substantially identical construction as the first shipping container; and:stacking the second shipping container on top of the first shipping container.