XXL 24×24 White Poly Mailers Shipping Bags - Set of 15 Quantity of 15. Each mailing envelope contains a strong adhesive self-sealing strip. Simply peel and fold over to seal each package safely and securely. Strong & Durable Construction- crafted with the premium material, making them not easily punctured and damaged. The reinforce sealing on the edge of the plastic mailing bag makes it tear-resistant and waterproof. You can count on our mailer bags to keep your packages safe until they reach to destination.