The Top Flight #10 Security Strip & Seal Envelopes are designed for both personal and business mailing needs. Each standard #10 envelope measures 4 1/8" x 9 1/2" and is made from 24 lb heavyweight paper, providing durability and a professional look.

These envelopes feature a security tint that prevents the contents from being seen through the exterior, keeping sensitive documents and correspondence private. The self-sticking strip-and-seal closure requires no licking — simply remove the protective strip covering the adhesive and press the flap down firmly to create a secure seal. Double side-seam construction adds extra strength for added security.

Each box contains 500 envelopes, making this an excellent value for households and businesses with high-volume mailing needs. The product carries a 4.8 out of 5 star rating from over 1,380 Costco members.