can then be recessed through the hole 56 back into the space between the main bin floor 130 and the main bin bottom 48 the insert 132 might be prevented from being entirely removed from the assembly 10 such as by flanges on rear as is representatively shown for the insert 36 fig8 if such a flange is a part of the insert 132 the insert 132 can be removed entirely from the assembly through the bottom aperture 51 formed in the bottom 48 of the main bin 12 the bottom aperture 51 is formed sufficiently wide so that the insert 132 can be passed through it in fig6 further alternative positions for dividers are shown for the main compartment of the main bin 12 as described above the dividers 72 74 can be inserted into the slots or guides 75 and or 73 and as easily can be removed to make the main compartment configured as desired in addition another alternative configuration can be made by inserting the divider 136 in a longitudinal direction in the slots or guides 138 on the rear partition 64 and 140 on the inside of the front wall 54 in fig8 the operation of the inserts 36 40 is illustrated when it is desired to have the trays 16 18 part of the assembly 10 the operation of the insert 36 in the first or upper tray 16 is shown as representative for itself and the insert 40.