Abstract: An organizer for use with a school desk includes a tray having a bottom and four integrally formed side walls, a removable divider wall extending between two of the side walls, the divider wall removably retained by connecting features on the intersecting side walls. The removable divider wall includes a plurality of first connectors spaced apart by predetermined distances along the divider wall adapted to removably retain a secondary divider, and at least one side wall opposite the divider has a plurality of second connectors spaced apart corresponding to the first connectors of the divider and adapted to removably retain the secondary divider. Each corresponding first connector and second connector are adapted to removably retain the secondary divider therebetween.