Keep mail safe by using these Quality Park Survivor open-end self-seal-closure expansion mailers with 14-pound Tyvek material. Secure and protect items while in transit with these open-end expansion mailers. Made with 14-pound Tyvek material these mailers withstand harsh weather conditions stand up to extensive handling and resist tears moisture and other damage. These Quality Park Survivor open-end mailers have an expandable design accommodating bulky items and feature a self-seal FlapStick closure ensuring contents stay safely inside. • Catalog envelopes are a convenient and reliable choice for personal and business mailing purposes. • White Tyvek envelopes provide superior protection for mailing important materials or documents. • Dimensions: 10 L x 13 H; size #13.5. • Flap-Stik self-seal closure provides a clean quick seal immediately upon contact. • 100 envelopes per carton. • Water- and moisture-resistant. • Expands up to 1.5 for greater storage capacity. • Sold as 100/Carton.