Featuring reinforced seams for extra holding power, these Staples 9" x 12" envelopes provide an ideal solution for mailing catalogs, flyers and other heavy documents and promotional materials. They are security-tinted to ensure the confidentiality of your enclosed documents, catalogs or booklets. Utilize these envelopes for company business, home business or personal use. Each of these Staples catalog envelopes features a gummed flap closure for a secure seal. Each envelope is large enough to accommodate standard letter-sized documents.