Ideal for home or office, the all-purpose Catalog Envelope, Peel & Seal. Perfect For Secure Everyday Home And Business Mailing. Our Security Windowless Envelopes Perfectly Standard Size 9 x 4 inchs, Paper Sizes And Other Large papers. Envelopes with closure are the perfect choice for mailing catalogs, documents, photos and other business mailings. They are also great for storage.