If you want to successfully reduce expenditures without creating a negative impact on quality, one easy way to do this is by using window envelopes when sending out mail correspondence and other missives to suppliers, clients, and business partners. Implementing the use of double window envelopes is a small, but significant way of improving efficiency while reducing business cost altogether. We personalize your mailing project with details like 8-1/2” x 11” full-color, uncoated paper and a #10 window envelope that shows your address.