What is the overall size and how is the interior divided? Can the interior dividers be moved? How many dividers are in it?

The Systainer is not divided inside. Festool does not make dividers for it. There a version of the SYS MINI that includes an insert with compartments, but they are not movable, link below to that item (203821).External Dimensions: H 2-3/4" x W 10-7/16" x D 6-3/4" Internal Dimensions: H 2-1/16" x W 10" x D 6-1/16"https://www.festoolproducts.com/festool-203821-mini-t-loc-systainer-uni-w-transparent-lid.html