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A unitary plastic container, which is optionally used for waste collection comprises a base, a front wall, a back wall and two opposing side walls, each wall extending upwardly from the base to define an open container top and an interior container volume. Each side wall has an outwardly extending s

A unitary plastic container, which is optionally used for waste collection comprises a base, a front wall, a back wall and two opposing side walls, each wall extending upwardly from the base to define an open container top and an interior container volume. Each side wall has an outwardly extending sidewall portion which is outwardly offset relative to the rest of the container side wall. In each outwardly extending sidewall portion, an elongated cutout, indentation or channel is present. The elongated channel has a forward opening, a rearward opening and an elongated side opening extending from the forward opening to the rearward opening. The elongated channel lies within the interior container volume and divides the outwardly extending sidewall portion into two areas: an upper outwardly extending sidewall portion and a lower outwardly extending portion. The outwardly open elongate channel may be fitted with a reinforcing sleeve.

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1. A container comprising: a) a unitary plastic container body comprising a container base, a container front wall, a container back wall, and two opposing container side walls, each container wall extending upwardly from said container base to define an open container top and an interior container

1. A container comprising: a) a unitary plastic container body comprising a container base, a container front wall, a container back wall, and two opposing container side walls, each container wall extending upwardly from said container base to define an open container top and an interior container volume, each container side wall comprising: an upper outwardly extending sidewall portion, a lower outwardly extending sidewall portion, an upper recessed sidewall portion residing between said upper and lower outwardly extending sidewall portions, and a lower recessed sidewall portion residing below said lower outwardly extending sidewall portion;said upper outwardly extending sidewall portion, said upper recessed sidewall portion, and said lower outwardly extending sidewall portion together defining there-between an elongated channel having a forward opening, a rearward opening and an elongated side opening extending from said forward opening to said rearward opening;said upper outwardly extending sidewall portion comprising an upper shelf surface residing within said container interior;said lower outwardly extending sidewall portion comprising a lower shoulder surface; wherein said upper shelf surface and said lower shoulder surface are complementary surfaces so that said upper shelf surface of a lower one of said containers can abut against the lower shoulder surface of an upper one of said containers, thereby facilitating the stacking of a plurality of said containers; andb) a pair of open ended elongated sleeves, each sleeve fixed within a corresponding elongated channel in each of said container side walls. 2. The container of claim 1 wherein said open ended elongated sleeves are tubular. 3. The container of claim 2 wherein said open ended elongated sleeves are fabricated from a material selected from the group consisting of metals, thermoset plastic materials, and thermoplastic materials. 4. The container of claim 2 wherein said open ended elongated sleeves are fabricated from at least one metal. 5. The container of claim 1 wherein the vertical dimension of said container back wall is larger than the vertical dimension of said container front wall so that each of said container side walls has an upper edge which angles upwardly from said container front wall to said container back wall. 6. The container of claim 1 wherein, in each container side wall, said upper outwardly extending sidewall portion has an outward extending distance relative to said lower recessed sidewall portion, said lower outwardly extending sidewall portion has an outward extending distance relative to said lower recessed sidewall portion, said outward extending distance of said upper outwardly extending sidewall portion and said outward extending distance of said lower outwardly extending sidewall portion being substantially equivalent. 7. The container of claim 1 further comprising a lid. 8. The container of claim 1 wherein said lower outwardly extending sidewall portion in each container side wall comprises a plurality of vertical grooves that are laterally spaced relative to one another. 9. The container of claim 8 wherein said vertical grooves divide said lower outwardly extending sidewall portion into a plurality of outwardly extending islands which are laterally spaced relative to one another. 10. The container of claim 1 wherein at least one reinforcement rib is present in at least one of the container base, front wall, back wall, or side walls. 11. The container of claim 1 wherein said container body is fabricated from a plastic material selected from the group consisting of thermoset plastic materials, thermoplastic materials and combinations thereof. 12. A container comprising: a) a plastic container body comprising a container base, a container front wall, a container back wall, and two opposing container side walls, each container wall extending upwardly from said container base to define an open container top and an interior container volume, each container side wall comprising: an upper outwardly extending sidewall portion, a lower outwardly extending sidewall portion, an upper recessed sidewall portion residing between said upper and lower outwardly extending sidewall portions, and a lower recessed sidewall portion residing below said lower outwardly extending sidewall portion;said upper outwardly extending sidewall portion, said upper recessed sidewall portion, and said lower outwardly extending sidewall portion together defining there-between an elongated channel having a forward opening along said container front wall, a rearward opening along said container back wall, and an elongated side opening extending from said forward opening to said rearward opening;said upper outwardly extending sidewall portion comprising an upper shelf surface residing within said container interior;said lower outwardly extending sidewall portion comprising a lower shoulder surface; wherein said upper shelf surface and said lower shoulder surface are complementary surfaces so that said upper shelf surface of a lower one of said containers can abut against the lower shoulder surface of an upper one of said containers, thereby facilitating the stacking of a plurality of said containers; andb) a pair of open ended elongated sleeves, each sleeve fixed within a corresponding elongated channel in each of said container side walls. 13. The container of claim 12 wherein a lower portion of said container front wall is outwardly leaning and said container back wall is outwardly leaning, thereby facilitating the nesting of a plurality of said containers. 14. The container of claim 13 wherein, said lower recessed sidewall portion in each container side wall is outwardly leaning, thereby facilitating the nesting of a plurality of said containers. 15. The container of claim 14 wherein, in each container side wall, said upper outwardly extending sidewall portion has an outward extending distance relative to said lower recessed sidewall portion, said lower outwardly extending sidewall portion has an outward extending distance relative to said lower recessed sidewall portion, said outward extending distance of said upper outwardly extending sidewall portion and said outward extending distance of said lower outwardly extending sidewall portion being substantially equivalent. 16. The container of claim 12 wherein at least a portion of said upper shelf surface and at least a portion of said lower shoulder surface are complementary contoured surfaces so that the contoured surface of said upper shelf of a lower one of said containers can engage the contoured surface on said lower shoulder of an upper one of said containers, thereby facilitating the stacking of a plurality of said containers. 17. The container of 12 wherein said lower outwardly extending sidewall portion in each container side wall further comprises a plurality of vertical grooves that are laterally spaced relative to one another. 18. The container of claim 17 wherein said vertical grooves divide said lower outwardly extending sidewall portion into a plurality of outwardly extending islands which are laterally spaced relative to one another. 19. The container of claim 17 wherein said upper shelf surface has a plurality of knobs which are complementary to the vertical grooves in said lower outwardly extending sidewall portion so that the knobs on said upper shelf surface of a lower one of said containers can engage the grooves in said outwardly extending sidewall portion of an upper one of said containers, thereby facilitating the stacking of a plurality of said containers. 20. A container comprising: a) a plastic container body comprising a container base, a container front wall, a container back wall, and two opposing container side walls, each container wall extending upwardly from said container base to define an open container top and an interior container volume, each container side wall comprising: an upper outwardly extending sidewall portion, a lower outwardly extending sidewall portion, an upper recessed sidewall portion residing between said upper and lower outwardly extending sidewall portions, and a lower recessed sidewall portion residing below said lower outwardly extending sidewall portion;said upper outwardly extending sidewall portion, said upper recessed sidewall portion, and said lower outwardly extending sidewall portion together defining there-between an elongated channel having a forward opening along said container front wall, a rearward opening along said container back wall, and an elongated side opening extending from said forward opening to said rearward opening;said upper outwardly extending sidewall portion comprising an upper shelf surface residing within said container interior;said lower outwardly extending sidewall portion comprising a lower shoulder surface; andb) a pair of open ended elongated sleeves, each sleeve fixed within a corresponding elongated channel in each of said container side walls; wherein a lower portion of said container front wall is outwardly leaning, said container back wall is outwardly leaning, andsaid lower recessed sidewall portion in each container side wall is outwardly leaning, thereby facilitating the nesting of a plurality of said containers;said upper shelf surface and said lower shoulder surface are complementary surfaces so that the said upper shelf surface of a lower one of said containers can abut against the lower shoulder surface of an upper one of said containers, thereby facilitating the stacking of a plurality of said containers;and in each container side wall, said upper outwardly extending sidewall portion has an outward extending distance relative to said lower recessed sidewall portion, said lower outwardly extending sidewall portion has an outward extending distance relative to said lower recessed sidewall portion, said outward extending distance of said upper outwardly extending sidewall portion and said outward extending distance of said lower outwardly extending sidewall portion being substantially equivalent. 21. A nested container stack comprising a plurality of containers defined as in claim 12, 13, 14, 15, 20, 16, 17, 18 or 19, wherein the base of an upper container is received through the open top of a lower container so that a portion of said upper container is received within the interior volume of said lower container. 22. A container comprising: a) a plastic container body comprising a container base, a container front wall, a container back wall, and two opposing container side walls, each container wall extending upwardly from said container base to define an open container top and an interior container volume, each container side wall comprising: an upper outwardly extending sidewall portion, a lower outwardly extending sidewall portion, an upper recessed sidewall portion residing between said upper and lower outwardly extending sidewall portions, and a lower recessed sidewall portion residing below said lower outwardly extending sidewall portion;said upper outwardly extending sidewall portion, said upper recessed sidewall portion, and said lower outwardly extending sidewall portion together defining there-between an elongated channel having a forward opening along said container front wall, a rearward opening along said container back wall, and an elongated side opening extending from said forward opening to said rearward opening;said upper outwardly extending sidewall portion comprising an upper shelf surface residing within said container interior;said lower outwardly extending sidewall portion comprising a lower shoulder surface; andb) a pair of open ended elongated sleeves, each sleeve fixed within a corresponding elongated channel in each of said container side walls; wherein a lower portion of said container front wall is outwardly leaning, said container back wall is outwardly leaning and said lower recessed sidewall portion in each container side wall is outwardly leaning, thereby facilitating the nesting of a plurality of said containers;at least a portion of said upper shelf surface and at least a portion of said lower shoulder surface are complementary contoured surfaces so that the contoured surface of said upper shelf of a lower one of said containers can engage the contoured surface on said lower shoulder of an upper one of said containers, thereby facilitating the stacking of a plurality of said containers;and in each container side wall, said upper outwardly extending sidewall portion has an outward extending distance relative to said lower recessed sidewall portion, said lower outwardly extending sidewall portion has an outward extending distance relative to said lower recessed sidewall portion, said outward extending distance of said upper outwardly extending sidewall portion and said outward extending distance of said lower outwardly extending sidewall portion being substantially equivalent. 23. A container comprising: a) a plastic container body comprising a container base, a container front wall, a container back wall, and two opposing container side walls, each container wall extending upwardly from said container base to define an open container top and an interior container volume, each container side wall comprising: an upper outwardly extending sidewall portion, a lower outwardly extending sidewall portion, an upper recessed sidewall portion residing between said upper and lower outwardly extending sidewall portions, and a lower recessed sidewall portion residing below said lower outwardly extending sidewall portion;said upper outwardly extending sidewall portion, said upper recessed sidewall portion, and said lower outwardly extending sidewall portion together defining there-between an elongated channel having a forward opening along said container front wall, a rearward opening along said container back wall, and an elongated side opening extending from said forward opening to said rearward opening;said upper outwardly extending sidewall portion comprising an upper shelf surface residing within said container interior;said lower outwardly extending sidewall portion comprising a lower shoulder surface;wherein said upper shelf surface has a plurality of knobs which are complementary to laterally spaced vertical grooves present in said lower outwardly extending sidewall portion so that the knobs on said upper shelf surface of a lower one of said containers can engage the grooves in said lower outwardly extending sidewall portion of an upper one of said containers, thereby facilitating the stacking of a plurality of said containers; andb) a pair of open ended elongated sleeves, each sleeve fixed within a corresponding elongated channel in each of said container side walls; wherein a lower portion of said container front wall is outwardly leaning, said container back wall is outwardly leaning, and said lower recessed sidewall portion in each container side wall is outwardly leaning, thereby facilitating the nesting of a plurality of said containers. 24. A nested container stack comprising a plurality of containers defined as in claim 22 or 23, wherein the base of an upper container is received through the open top of a lower container so that a portion of said upper container is received within the interior volume of said lower container.