A shelving unit includes a plurality of posts, a plurality of shelf-supporting beams attached to the plurality of posts to form a shelf support frame, and a shelf. The shelf has a plurality of sides seated on the shelf support frame. The plurality of the sides of the shelf includes a depending flange. At least one of the depending flanges extends downwardly along a respective shelf-supporting beam between about 30% and about 100% of the height of the shelf-supporting beam. Another shelf unit is further disclosed where the shelves include a color that corresponds to a color-coded system for organizing the storage of items on the shelving unit. A method of organizing a shelving unit utilizing the color-coded shelf system is also disclosed.