OEM Quality Park Jumbo Survivor Envelopes come in a box of 25 and are designed for durability and security. These envelopes feature a super-strong Tyvek construction and a convenient Flap-Stik closure, making them ideal for storing artwork, plates, negatives, maps, and blueprints. They are heavyweight and moisture-resistant, ensuring they won't rip, tear, or puncture, providing a more secure option compared to standard paper envelopes.