Expandable Self-Seal Envelopes are designed for efficient and secure mailing. Featuring a simple peel-and-seal closure, these envelopes eliminate the need for moisture to seal, making packing quick and mess-free. A tear-off strip keeps the adhesive clean from dust, extending the shelf life. With expandable sides, these envelopes can hold bulkier items, providing flexibility for shipping larger contents. Constructed from sturdy 40 lb. paper stock, they offer durability to protect items in transit.