|Super-strong expanding wallets keep projects secure. Extra-thick, 80-pt. soil-resistant Letha Tone® covers and rip-proof Tyvek® reinforcement at top and bottom corners of the gusset. Double-reinforced flap made of 21-pt. stock with a hefty elastic cord provides added security. Index has extra-large, 1/3 cut double top tabs aligned in a straight line for easy viewing.