Easily protect and store important documents, negatives, blueprints and more with these Quality Park Tyvek Envelopes. They are manufactured with a super-strong construction and feature a convenient Flap-Stik closure. These heavyweight white envelopes are moisture resistant and won't rip, tear or puncture. They have an open end, making it a breeze to insert and pull out artwork, plates, maps and more. Ideal for home or office use, these sturdy jumbo envelopes are much stronger and more secure than paper envelopes.