Envelope - 12 x 18.5 is a dependable mailing envelope for everyday mailing, filing and document handling in homes, offices, schools, clinics, retail counters and busy mailrooms. It features polypropylene. Zippered closure. Clear front incket. Expanding 1-1/4 in. guss. Key details include 12 x 18.5 in. The easy-to-use closure makes it simple to prepare letters, forms, invoices, statements and other documents while helping keep contents neat, protected and ready for delivery. Its practical size, pack quantity and ready-to-use design help customers choose the right supply quickly, stay organized and maintain a smooth mailing workflow for routine correspondence and administrative tasks.