Systems with disposable trays

In combination, a collapsible crate and a disposable tray positioned within said crate, said crate being rectangular and bounded by four vertical corner uprights defining the four corners of said crate with two opposing sides and two opposing ends further defined therebetween, opposing sides of said crate having a lower horizontal side bar and an upper horizontal side bar extending between respective corner uprights defining said opposing sides, opposing ends of said crate having a lower horizontal end bar and an upper horizontal end bar extending between respective corner uprights defining said opposing ends, each end bar being hingedly secured to the respective upright adjacent thereto, each end bar comprising two bar pieces being secured together with a central hinge located centrally of said end bars, a bottom bar extending generally parallel to said side bars, said bottom bar having slot means with said central hinge of each said lower end bar being slidable in said slot means, said bottom bar being slidably connected to each said lower end bar and said crate being collapsible to bring the side bars closer to each other to the extent each said central hinge is slidable in said slot means except when said disposable tray is positioned within said crate and rests upon said bottom bar.