Our modular desk organizer trays are designed to enhance desk organization, providing a catchall for your office supplies from papers and mail, to pens and pencils, to paperclips and more. The trays can be used on their own, or mixed-and-matched and stacked to create a fully customizable office organization set that perfectly meets your organization needs. The Medium Accessory Trays and Small Accessory Trays stack perfectly on top of either the Letter Tray or the Large Accessory Tray. The This & That Tray, and the Softie Grip Grass (both made of soft, bendable silicone) fit perfectly in the Medium Accessory Tray, for added small item storage. The Letter Trays and Landscape Letter Trays can be stacked on top of each other, to create as many tiers as needed to organize papers. The Letter Tray and Landscape Letter Trays each hold up to 300 sheets of paper, providing a high capacity paper tray organizer for desk. The trays come coordinating colors, which not only match with each other but also with the full range of Poppin office supplies, from pens to notebooks to file folders and more. Available sets include: white desk organizer, dark gray desk organizer, slate blue desk organizer, pink desk organizer, sage desk organizer, and aqua desk organizer.