Kemet Insert: - Rules of Play says:
Insert compatible with Kemet®, and has space for the Ta-Seti®, Seth®, C3K Crossover®, and promo power tile expansions. The design provides both efficient storage and improved game play. Many of the trays can be utilised during the game, and they greatly aid set-up and clear-away times. The boards and rule books act as a lid on top of the trays.