Durable multi-purpose envelope; dual purpose seal allows for multiple uses; use the moisture activated gummed seal for mailing or the strong metal clasp for repeated use and storage purposes. Extra heavy-duty opaque 28 lb. Brown kraft material provides privacy of contents. Brown kraft 28# 10"x13" open end with metal clasp/ gum Limited Papers is made from heavy duty recycled brown kraft contains 20% post-consumer waste.