These durable heavy-duty brown kraft mailers are particularly beneficial when shipping UPS. Made from rugged .037 Kraft material, these kraft mailers have an indefinite shelf life. Our kraft mailers feature a re-usable tuck-in-tab design and are the most rigid mailers available. These kraft mailers range in size from 6" x 8" to 21" x 27". Kraft Mailers are good for photo mailers, document mailers, and traditional mailers stay flat. Easily Imprinted!!