Tier Count: You can find these in various configurations, typically ranging from single trays up to 4-tier or 5-tier stacks.
Material:
Metal/Steel Mesh: Durable, stable, and often have a modern, minimalist industrial look.
Plastic: Lightweight, cost-effective, and often available in a wider range of colors.
Wood/Bamboo: Offers a more aesthetic, natural look suitable for executive or home office setups.
Functionality:
Stackable vs. Fixed: Some systems are fixed, while others are modular, allowing you to add or remove tiers as your needs change.
Slidable Trays: Some designs feature trays that slide out like drawers, making it easier to reach documents in lower or middle layers.
Extra Storage: Higher-end models often include additional side compartments for pens, sticky notes, or small office supplies.