Common materials include paper/paperboard (used for hanging folders), various plastics such as polypropylene and polyurethane (for dividers and document holders), and metal like steel or steel mesh for sturdier organizers.
Portability features include built-in handles and contoured or comfort grips on file boxes, integrated handles on crate-style organizers, and generally lightweight, easy-to-carry designs.
Many file boxes have indexed covers or lids that allow multiple boxes to be stacked securely. Magazine-style holders use a vertical profile to minimize desktop footprint and save space.
File boxes commonly use durable latches or tight-fit snap lids to keep contents secure and dust-free. Some boxes also accommodate a small padlock or zip tie for added security.
Many organizers are built for letter-size paper (8.5" x 11"). Several file boxes are also noted to accommodate both letter and legal hanging folders.