The mail-piece design analyst at the post office can provide you with a list of acceptable colors to use. Size Matters Envelopes are available in a variety of grades, colors, finishes, weights, sizes and styles, each with a different cost. Most businesses save time and money by using standard-size envelopes. However, when inserts are thick or bulky, extra allowances must be made. All must be rectangular.
Odd shapes are nonmailable.
Ask your local printer for a cost estimate on a custom-made envelope. There are many elements to consider when it comes to choosing the right envelope for your business's or organization's direct marketing message. The envelope should be part of the entire design process, not an afterthought. For maximum impact, consult your local printer or graphic designer early in the project design process. They can advise you on envelope color options, sizes, styles, designs and other elements you can utilize to add impact to your mailing.