Prestige Alvin Art Envelope 29 X 40 - Pkg of 6 - Art envelopes are invaluable storage devices that are sturdy enough to handle many of the dangers that exist for paper documents. This thick art envelope can keep moisture from affecting your artwork, blueprints or other work that uses paper to display it. With each heavy-duty .010" vinyl envelope, you will have three sides of your document kept safe by a heat-sealed, clear vinyl barrier. The fourth side is open to allow for the easy insertion of your important document. If you want to display your work elegantly, there is an acid-free, black paper insert included in each one. Six envelopes are included in each package.