Introducing our premium Tyvek envelopes, designed for durability and convenience. These #13 1/2 envelopes feature a square flap and a reliable self-adhesive closure, making them perfect for sending important documents securely. Measuring 10 x 13 inches, they are spacious enough to accommodate larger items while maintaining a sleek profile. Ideal for both personal and professional use, these envelopes are packaged in a cost-effective box of 100.