Versatile way of carrying pens and markers. Trays lock into the satchel, securing markers and pens where placed even if the satchel is flipped upside-down. Durable polypropylene satchel is stackable and can be divided into compartments. Features secure latches and carry handle. Extra depth allows for storage of larger, bulkier supplies. Use open core for paper and albums or customize up to eight compartments for multiple storage options. Removable divider. Can use up to four marker storage trays. Acid free.