Heavyweight Envelope Set - pack of 30 single mailing envelopes accommodates variety of small & large documents for home, office, business, legal & more High-Quality Paper: heavy-duty 28lb brown kraft envelopes provide confidential protection & exceptional rip, tear & puncture resistance Double Seal Design: enhances security for envelopes letter size. equipped with reusable dual prong clasps and gummed seals with tough adhesive glue, ensuring reliability for work and personal mailing Catalog Orientation: classic open end style enables fast, convenient stuffing for letter, legal document, pamphlet, coupon & other common mailers Letter Size Pricing: ideal 6 x 9 envelopes offers maximum space within USPS 1-stamp dimension requirements Clasp Envelopes – 6x9 Inch Brown Kraft Catalog Envelopes - 30 Pack - With Clasp Closure & Gummed Seal – 28lb Heavyweight Paper Envelopes for Home, Office, Business, Legal or School.