The Park Preserve 42353 Jumbo Envelopes are large plain envelopes weighing 28 lbs each, measuring 12-1/2″ x18-1/2″. This pack contains 25 envelopes from the trusted brand Quality Park. These sturdy and reliable envelopes are perfect for shipping and storing large, bulky items in a professional and secure manner. Ideal for businesses and individuals looking for a durable packaging solution that provides ample room for their products.