These envelopes are perfect for people who need to protect their documents or artwork. Since it is made of .10" heavy duty vinyl will allow it to keep your item from being wrinkled or damaged. Three sides of this are heated and the fourth side opens to allow you to get your piece in place. You can easily make sure it is in place as the vinyle is clear and will keep out dirt, moisture and other contaminents that will ruin it. The open side is 11" and has a paper insert. The size is perfect for art sheets and portfolio pages making this ideal for artists as well as architects and other professionals.