Designed to hold flat, bulky items, these envelopes are a great way to protect your promotional catalogs and brochures during delivery. A powerful adhesive helps ensure a secure seal and closure. Ideal for bulky items that should be kept flat, such as brochures, pamphlets, magazines and more. Sturdy paper construction can withstand heavy handling. Made of 80-lb paper. Sturdy paper stock prevents materials from bending in transport.