48 packs of kraft clasp envelopes, each pack with 4 envelopes measuring 9" x 12"—sturdy and reusable, perfect for mailing or storing documents. Clasp Envelopes, 9x12, 4 Pack. This product falls under the mailing essentials category, known explicitly as brown kraft security envelopes. Its primary function is to securely hold documents, letters, or small items for mailing or storage purposes. In a school or office setting, these brown envelopes are convenient. They can send important documents, store student assignments, or organize office supplies. One of the main benefits of these security envelopes is their cost-effectiveness. A pack of four means you always have a spare envelope, saving time and money. The sturdy metal clasp closure ensures your documents stay safe and secure, adding to the product's durability and utility. What sets these envelopes apart from others is their size. At 9x12 inches, they can comfortably fit standard-sized papers without folding them, preserving the integrity of your documents.