10" x 13" catalog envelopes feature a quick, easy, Redi-Seal closure ideal for bulk mailings. Redi-Seal closure includes a pressure-activated latex adhesive on two surfaces. Just press together for a strong, durable seal - no paper strips or moisture required. Redi-Seal envelopes are the perfect mailroom update for concerns about surface germs while saving time and cutting waste with every mailing. Envelopes are compatible with inkjet printers but are not recommended for laser printers. Heavyweight, 28 lb. Kraft stock is opaque to protect private contents and durable enough for hard office tasks. Center seam adds strength to handle heavy contents. Large envelopes store letter-size papers without folding or creasing. Classic, open-end manila envelopes are ideal for mailing manuscripts, homeschool packets, workbooks, sales literature, newsletters or contracts. Mail heavy enclosures with confidence.