Heavy-duty expanding wallet features a 24 point reinforced flap with extra-thick elastic cord for added security and fully lined, Tyvek gussets with rollover feature to protect documents in transit. Rip-proof Tyvek reinforcements across inside flap offers added strength. Wallet protects important documents during transit. Extra-long flap completely covers your letter-size contents, even when the file is fully expanded to 3-1/2" (875 sheets). Extra-wide wallet accommodates file folders inside. Extra thick covers have a 24 point front and back. Added Tyvek strip inside the back cover protects against tearing along critical stress points.