The Pacon Classroom Keepers 30-Slot Mailbox, Blue (001318) makes it easy to store, protect, and organize classroom materials. Each mailbox is designed with an individual name tab on each slot, making it easier for you to keep things organized. Each slot is 1-3/4 inches in height, 10 inches in width, and 12-1/2 inches in depth, which is the perfect size for papers, magazines, notebooks, and more. These mailboxes are sturdy corrugated boxes that are made of recycled material and are recyclable. The entire unit measures 21 inches high, 31-5/8 inches wide and 12-3/4 inches deep. The Pacon Classroom Keepers 30-Slot Mailbox can be mixed and matched with both the 15-slot and 10-slot mailboxes, allowing you to find the perfect storage solution for your needs. Pacon Classroom Keepers keep you organized, allowing you to let your imagination shine! Pacon offers customers an extensive line of arts and crafts products, strengthening its ability to be a single-source supplier for educational aids, paper products and arts and crafts.