At the full size of a SYSTAINER SYS 4 TL and equipped with three large drawers (with dividers), the new SORTAINER SYS 4 is an all-new, lighter format than the traditional Sortainers, with a new style of drawer latch, removable dividers, and placements for removable (optional) Storage Boxes. Optional Storage Boxes (available as a set) can be used for even greater onsite efficiency. Compatible with T-LOC and Classic SYSTAINERS (attached to bottom).