DIMENSIONS: Standard 9″ x 12″ size perfect for mailing letter-size and legal documents without folding, ideal for professional presentations and multi-page materials PREMIUM MATERIAL: Crafted from heavyweight 28lb white paper that provides exceptional durability and a professional appearance for important mailings SECURE CLOSURE: Features a reliable moisture-activated gum flap seal that keeps contents protected and secure during transit BOOKLET STYLE: Open side design with booklet flap allows easy insertion of documents while maintaining a neat, professional presentation BULK QUANTITY: Package contains 100 white envelopes, making them perfect for high-volume business mailings, office use, or personal correspondence