Itoya Poly Envelopes are the industry standard in polypropylene filing and storage envelopes. Their lightweight yet durable construction resists moisture to protect your valuables from the elements. See-through design allows for easy identification of the contents while velcro allows for quick fastening and releasing of the envelope flap. Durable polypropylene construction is moisture stain and tear resistant. Great for office school craft hobby art and home. Letter size. Side Loading. Dimensions:13 x 9-3/8. Sold in packs of 12. Other sizes also available.