Usable size--4x7 inch, outside size: 4x8 inch. Pack of 25pcs. Whether you are thinking of mailing documents or something else, these padded sturdy envelopes should be your first choice. The bubble lining provides a layer of padding that normal laminated envelopes don't. | Opaque and Lightweight--These bubble lined envelopes are lightweight and do not add to your shipping costs. padded envelopes are completely opaque and protect the shipped item from prying and curious eyes. You can mail sensitive documents without fear in these bubble mailers. | Super durable--The surface of this kraft bubble envelopes made from a durable kraft paper. The interior built with bubble lined wall construction for extra protection during transit, ensure the packages arrive in great condition. | Tight seal--The selfseal closure provides a reliable, tamper-evident tight seal to secure all enclosures. The padded envelopes keep your shipment safe from damage and tampering until delivery. Extra smooth surface is perfect for handwriting, labeling and stamping. | Multipurpose Envelopes--These mailer envelopes can be used in offices, at home, in shops, schools and everywhere where there is a need for shipping. These mailers come with a full guarantee. If you are not satisfied with the product we will refund or replace.