About this item Catalog envelope 10×13 is a reliable choice for multiple kinds of personal and business mailing purposes. Envelopes feature gummed and clasp closures to keep your documents secured inside the envelope. Clasp envelope 10×13 has a moisture-activated seal with deep gumming on the flap to create a permanent seal. Mailing envelopes are made from brown kraft paper that conceals contents from prying eyes, can be reusable for efficient, long-lasting use. Catalog envelopes include 12 pieces per pack, you’re guaranteed to have plenty of envelopes for all of your home or office mailing needs.