Heavy-duty expanding wallet features a 24 point reinforced flap with extra-thick elastic cord for added security and rip-proof, fully lined, Tyvek gussets to protect documents in transit. Extra-long flap completely covers your letter-size contents, even when the file is fully expanded to 5-1/4". 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.