As an adjunct teacher at a community college, I must take everything to & from school everyday. This box allows me to keep all the things I need separated and secure for the long walk from parking lot to classroom. Using dividers with Velcro, the main body can be separated into four different areas - from side to side - which provides each class its own area for textbooks, handouts, graded assignments, etc. Even when the slots are filled, there is still about 8" of open space above for bulky items.The little compartments on the sides and front hold all of my office supplies from scissors and tape, to staplers and sticky notes. The pen holders are used for - what else - red pens & pencils! This huge box is the most useful storage and transportation item I have ever found.