Heavy-duty expanding file features a sturdy leatherlike material construction and an elastic cord on the flap closure for added security and protection. Tuff gusset extends into front and back panels twice as far as standard files. Double-thick front and back panels with Tuff heavy-duty reinforcement liner board. 31 pockets are labeled 1 to 31. Perfect for salespeople or service personnel who spend most of their time on the road and need a portable reference file.