Unique lid allows the box to slide out easily when stacked File tote box features a snap-tight lid that secures stored contents. Stackable box is made of durable polypropylene. Keeps your documents protected. Features a split-lid for easy access to content. Tongue-and-groove lid design allows for easy access when stacked by allowing the box to be slid forward with ease. Office Depot stackable clear file box lets you see its contents without opening it.