The Creebe 10x13 large mailing envelopes set includes 20 yellow envelopes crafted from 100gsm high-quality kraft paper, known for its tear-resistant durability and non-glossy finish, ideal for easy writing. Each 10x13 clasp envelope features a reusable metal clasp and a moisture-activated gummed seal, ensuring secure document storage, transport, and privacy. These versatile manilla envelopes are perfect for personal, home, or business use. The 10x13 size is excellent for bulk mailing and storing oversized items like manuscripts, photos, books, crafts, and more. All yellow envelopes come neatly packed in a sturdy box, making organization and shipping hassle-free.