10×13 First Class Envelopes Our Large 10 x 13 inch First Class Envelopes are printed with the words “First Class” printed along the outer edge and in bold block letters in the middle of the envelope. These large business envelopes are printed on 24# white Kraft paper and are personalized with your company name and address. In addition to the standard return address printing, you also have the option of an additional line of imprint on the center bottom part of the envelope. 10 x 13 envelopes have an imprint area of 9 x 12 inches.
