I received an AARP Special Offer kit with a double window outer envelope. Double window envelopes allow for more internal information to show through to the reader. This gives great opportunities to tease info and display offers while maintaining a single mail sort since the outer envelope design doesn’t change.

If you’re able to print with a company that has highly variable technologies, the double window kit can perform well. You are able to have multi variations of copy on the letters teasing different info. You then can have a single outer envelope design, and maintain a single mail sort. Postage is roughly half the cost when it comes to direct mail marketing, which can easily increase when the mail sort begins to break down into separate strings.

This kit also features a perforated reply form and a BRE (Business Return Envelope). BRE’s are an investment by the company for new members because the postage is already paid for. By doing this, levels of response rates tend to increase because the readers don’t have to pay for their own postage. It’s give-and-take when it comes to the cost of acquisition vs. the dollars brought in by new members.

Try out the double window kit with your next test segment. Typically it works well in the financial and insurance spaces. I tend to see words like: “special offer enclosed”, “pay to the order of”, “financial information enclosed”, “insurance documents enclosed”, etc.