When durability is key, standard sulphite paper envelopes don’t make the cut. Roptex envelopes made with long-fiber brown Kraft paper offer the perfect solution. The paper used to make this #11 Roptex (Brown Kraft) envelope is SFI Certified and it grants it a much higher load-carrying capacity. They are perfect for sending international mails or when sending heavier items and thick stacks of documents. The #11 envelope size is larger than standard #9 and #10 office envelopes. This makes them ideal for companies that need to send multiple pages of standard documents. The envelope has a dual-diagonal-seam construction and a V-shaped flap.
This #11 brown Kraft envelope measures 4.5x 10.375 inches and it can accommodate a flat insert measuring 4.25 x 10.125 inches. Thanks to its enhanced durability, these envelopes are often used to file and store documents and items. These brown envelopes have classic styling and they are ideal for both business and personal mails.