Pendaflex Heavy Duty Expanding File with Extra-Thick Cover, Tyvek Reinforced Edges, 21 Pockets, AZ Tabs, Elastic Cord Closure, Letter Size (R117ALHD) HEAVY DUTY: Redrope covers with a double-reinforced flap are built to withstand heavy use over weeks and months and years GO AHEAD, GET STARTED: One row of pre-printed A-Z tabs will have you sorting and filing right out of the gate; another row of blank tabs allows you to personalize sections for your needs FLAP &amp; ELASTIC CORD CLOSURE: this system ensures your papers are secure while you store, carry or transport them ROOM TO EXPAND: Expanding sides grow as your files grow; Tyvek reinforced top edges keep even over-stuffed files in tact DECLUTTER 911: these 21-pocket expanding files are an easy way to keep paper hotspots clear; the kitchen table, kitchen counter, and office desk are all contained in minutes