"Designed with a patented SmeadGrip™ Technology nonslip grip, Easy Grip™ Pockets provide twice as much grip as ordinary file pockets and are easier to pick up and pull off shelves than ordinary pockets. With virtually tear-proof Tyvek® reinforcement, you’ll be holding on to this pocket for a long, long time. Holds letter-size files, expands up to 3.5""."