Quality Park Heavyweight Catalog Envelopes, Gummed, Brown Kraft, 12 x 15.5, 100 per Box, (41967) DURABLE: Made from heavyweight 28 lb. paper stock GUMMED: Fully gummed flaps provide a secure seal to keep contents secured MULTI-PURPOSE: These 12 x 15.5 envelopes are perfect for storing and mailing documents, catalogs, photo's and other home and business mailings IDEAL: These catalog envelopes are a great option for mailing, storage, and organizing GREAT VALUE: Conveniently packed in 100 count to reduce the frequency of repurchasing